Nice Game. I like the Graphics and Audio. I also liked the Menu and HUD. It was very cool to have different stages and different content. That was nice made! Also having 3 levels of difficulty was good. After finishing Easy I took the harder ones.
It was not Z instead Y for me. Small Laggs sometimes (Browser MS Edge on Windows)
Maybe WASD for Movement and Space to Jump. Maybe Double D or Double A to Dash and attack somewhere, maybe Left Click. It was hard for me to get into Arrows and Z to jump.