First off, the graphics of this game are extremely simple (just basic geometric shapes, as the name suggests), but it looks really, really good! It's even worth mentioning the little effect the borders of the "map" have when the player touches it.
The game is also really fun, but it gets boring when there's only purple shapes left. Talking about them, it might be a skill issue from me, but I don't like how you're pretty much guaranteed to take damage if you get to close before it splits. That normally wouldn't be a big deal, but the game kinda encourages you to get closer to enemies to deal higher damage.
Lastly, my game broke after a few waves. I cleared everything but nothing happened. I assumed one of the enemies went out of bounds and couldn't be killed, thus softlocking me.
Anyways. Really fun entry. I like it!