RPG Fan reviewed Loop Hero.

Loop Hero

[...]

There’s not a lot of visual variety to Loop Hero, but what is there is both sparse and intensely detailed. Character portraits show pixelated shading under the eyes and the pale faces of the survivors as they try to live and make do. Enemy sprites are vivid and animated, particularly bosses, who often radiate from the screen for their distinctive appearance. And the way the multiple card tiles knit together and create these densely populated maps is wonderful. The dreary colour palette won’t be to everyone’s taste, but it helps immerse you in the game’s atmosphere.

Throughout Loop Hero, you send your character on expeditions and gather materials for camp and to find out what’s happened to the world, which has been drowned in darkness. The people the hero encounters don’t remember anything, nor does the hero, so much so that every single expedition, the path is different. The only sure thing is that the pathway is cobbled stones, it always goes in a “loop,” and you can decide how long to stay and how many risks to take on each journey. The story isn’t the focus here, and while it’s decidedly sombre, there’s some light, surreal humour thrown in, but it just serves to emphasise the game’s core loop.

[...]

Pros

Hugely addictive gameplay, unique visual style, excellent music, encourages experimentation.

Cons

Often relies too much on random chance, story is kind of just there, a few finnicky Switch controls, card variety lacking late game.

Bottom Line

Loop Hero will put you in a spin—but it's the kind you won't be able to stop going round and around in.

Overall Score: 85

Loop Hero is successful:

500,000 Players Have Embraced Loop Hero!

Week One Sales Milestone, Steam Cards & Future Updates Revealed
We're so thrilled and blown away to announce that over 500,000 players have set out on loop adventures in the first week since Loop Hero's launch! But our biggest achievement has been to hit Overwhelmingly Positive on Steam user reviews - thank you all so much!

We're celebrating this all with a collaboration with Bard-the-zombie on a special series of Steam Trading Cards, available now in the game!

Next up, we're working on patches with quality-of-life updates you all asked for, including a system for saving during expeditions, new speed settings, and a deck of traits gained from bosses! After that, you can expect to see lots more content added to the game, such as new cards, transformations, classes and new music. We can’t wait to share more updates with you all soon!

Gamerant reviewed the auto-RPG Loop Hero:

Loop Hero Review

Loop Hero distills build-making, inventory management, and level creation into the primary mechanics of an auto-RPG, making it an innovative gem.

At first, Loop Hero might just look like another deck-building game, sprinkled with dime-a-dozen terms that blend together when one unfocuses their eyes over the front page of Steam: "indie," "pixel," "rogue-like," "RPG." However, the game's popularity is well-earned, and it is the perfect example of why indie games are so important - sometimes they manage to innovate something truly unique and special using even the most basic components. Loop Hero blends together familiar mechanics and tropes into something that feels totally refreshing, and it's worth sinking some time into.

[...]

here are three classes of hero to choose from, Warrior, Rogue, and Necromancer, all of whom require a different type of planning. There are countless types of tiles to unlock, and four chapters to the respectably-long (for a small rogue-like) campaign. The music is satisfyingly retro-funky, and the pixel-art is done right, with careful use of color and pleasingly nostalgic designs. On top of it all, there's a layer of polish, attention to quality-of-life, and intuitive design. Little details like the combat screen pausing when the player hovers over an enemy or inventory item, just in case they want to read a foe's stats or switch out a weapon on the fly, go a long way.

Downsides include the frustrations of randomized loot, an occasional grind to getting enough materials for the next camp upgrade, and the fact that by the time the fourth and final chapter rolls around there are few more secrets and combos to discover. Still, the game is a genuine gem, and for $15 at full price, it's worth getting hooked on.

Score: 4.5/5

PC Gamer has reviewed the rogue-like Loop Hero:

Loop Hero review

This charming "micro RPG" is one of 2021's early gems. 

Loop Hero is the rehydrated essence of a dozen misremembered, ancient games. From the moment the 16-color title screen fades in alongside dramatic chiptunes, you feel like you're playing some forgotten, VGA-era fantasy RPG, a game that still contains some of the mystery and difficulty of 1991, but gently modernized to 2021.

This isn't nostalgia for nostalgia's sake. Loop Hero presents a novel and dead-simple gameplay format that's strangely engrossing, considering much of your time playing it is hands-off

[...]

The spirit of early-'90s fantasy games, cleverly revived in an original and digestible form.
Score: 83/100

Thanks Henriquejr!

Loop Hero is now available on Steam:

Loop Hero

The Lich has thrown the world into a timeless loop and plunged its inhabitants into never ending chaos. Wield an expanding deck of mystical cards to place enemies, buildings, and terrain along each unique expedition loop for the brave hero. Recover and equip powerful loot for each class of hero for their battles and expand the survivors' camp to reinforce each adventure through the loop. Unlock new classes, new cards, and devious guardians on your quest to shatter the endless cycle of despair.

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Infinite Adventure: Select from unlockable character classes and deck cards before setting out on each expedition along a randomly generated loop path. No expedition is ever the same as the ones before it.

Plan Your Struggle: Strategically place building, terrain, and enemy cards along each loop to create your own dangerous path. Find balance between the cards to increase your chances of survival while recovering valuable loot and resources for your camp.

Loot and Upgrade: Strike down menacing creatures, recover stronger loot to equip on the fly and unlock new perks along the way.

Expand Your Camp: Turn hard-earned resources into campsite upgrades and gain valuable reinforcements with each completed loop along the expedition path.

Save the Lost World: Overcome a series of unholy guardian bosses over a grand saga to save the world and break the time loop of the Lich!