The android version kept crashing on startup (Galaxy S5) so this is all for the windows version.

The mechanics seem kinda at odds with the level design and the whole touch screen interface; the game encourages you to tap like it's going out of style but then punishes you with a hard rocket limit so you can't rocket projectiles out of the air, and since enemies drop hurtey-balls seemingly at random (and the levels seem to be random too, bad move) there's no strategy or perceivable though line to the level, contrasting to the bosses that are mindlessly easy. There's also a sort of Gradius syndrome going on here, as the power-ups are crazy good and you feel like a wimp without them. 

The SFX are laughably bad (if you are going to use s/bfxr  at least layer a couple on top of each other and post process it), and I hope that music's placeholder because it sounds like FL default loops mashed together, the graphics evoke a euroshmup vibe (in a bad way) with how nothing they are,  but the biggest problem on top of all that is it's just not fun.