I think you could decrease the delay of the controls, because it feels too unresponsive now. After a while I kinda got used to it, but still I think improving it would be a good idea. I suspect that this is one of your first games, and it's maybe not very innovative, but tbh you have a working game, and a good visual for taking damage (which is super important and I've seen much more complex games forgetting about it). Keep going! Btw, you can also check and rate my game.