I shoot sliding like John Wick! :D Game is a cool runner, it is played pleasantly, the graphics are minimalistic pixel art, with a beautiful palette. The sounds also fit seamlessly into the game. but there are some strange game design solutions. For example, why would I click "buy" if I can't buy anything else besides hearts? Maybe it would be better if you give the player a heart when he gets the required amount of coins? You can accompany it with sound or animation :) I also like to shoot in sliding, but apparently shaking the screen does not work for the bullet, collides with the surface and disappears :D Bug or feature?
I think it will be a good feature if you fix the bug :D Speaking of the difficulty of the game, in which areas I don't have time to react (I'm old for this shit). I would give a heart for every 50 coins in this game.