Not hearing good things about this game at all. Robert Boyd did a quick first impression thing on Twitter:

5 steps to build a tower, equipment split into two menus, have to run back to the crystal to start a wave then have to run back, no manual lock-on (sucks to be a ranged character) and a few other issues.

The devs replied to him saying that you could fix a lot of those issues in the settings and features.

I think I'll pass on this for awhile until I start hearing better things about it or that they fixed some of the glaring issues in a patch.