Combat is on the easy side, though—I only died twice throughout the game, and I played at least half of it with a combination of "limiters" equipped.
Limiters unlock throughout the game and make the Process spawn in greater numbers or hit harder or gain protective shields. Fighting with limiters engaged earns Red more experience. I could've made Transistor even tougher, but I enjoyed the balance I found with three out of 10 limiters equipped. I never want to use the limiter that reduces my memory pool, for example, because then I couldn't have as much fun combining functions.
With three limiters engaged, I did bottom out my health bar in some of Transistor's more intense fights. But that's not a death sentence—it overloads and disables an active function, restores your health, and lets you fight on. This led to some of my favorite battles, as I suddenly had to figure out how to finish off the Process with my go-to damage abilities disabled. I finished one battle with a single active function left. When they're all gone, it's lights out.