I like your game! I went for the 'shoot and you loose health mechanic ' too. I enjoyed the screen shake and the quick flash of particles when a triangle was destroyed. I also appreciate the controls on the back of the tutorial page, a lot of the 50+ games I've rated don't even have that. I thought the game played well and was fun.
If you wanted to improve, I suggest making the power shot go through enemies, I think that would help it feel even more satisfying and encourage the player to line up cook collateral kills. I also think the triangles that shoot should have some form of indicator that they are going to shoot to make it easier to dodge.
Overall a really fun experience!