Nice an simple little game!
I think that sometimes, with a simpler game. It's just nice to set your scope well and make sure you meet that criteria. I really can't give too much feedback on the game since just about everything that the game presents is done qutie solidly.
One props I will give is that the cute cover art of the Chattini is quite attractive. Among the tons of other games I saw, this was one of the first ones I played because the Chattini was cute.
I think the main feedback is just a hold to fire option instead of spamming the attack button. I also couldn't quite tell how much health I had.
I feel any other feedback I may have is more along the lines of wishing for more content rather then feedback.