Gonna start off with some issues first, the game lagged a lot in the menu (don't think its your fault though, gotta love webgl), the music isn't a thing (although doesn't matter too much), and sometimes crystals spawn too close to each other (just my opinion though). Also making the enemies collide is a really cool thing, but sometimes they spawn too close to each other and just explode instantly without me doing anything. And also sometimes enemies spawn literally right in front of the player and its impossible to avoid them (although this may be what you want, not sure).
On the plus side, the graphics and stuff are pretty simplistic but nice, the sound effects are nice (and also scared the hell outta me in the menu), the player is really "slidey" but I think that's a good thing because its set in space, and also trying to handbrake turn to avoid a rock and causing the enemies to crash into each other is genuinely great fun.
Again, really a nice game!