Normally I am quite skeptical when it comes to traditional platformer controls in a mobile game, but you actually pulled it off really well. The movement felt smooth and I never felt limited by the touch screen buttons, so well done! I also like the high risk high reward mechanic after each room. Though a minor nitpick would be that because of a phone screen's small form factor, it is a bit troublesome to spot your own bullet, but other than that I don't have much criticism gameplay wise :)