Good game.. Nice music and visuals as well.
I didn't understand the objective of the game but I'm certain that it's because of me.
Also, z/x didn't do anything for me. the scroll worked and the tap did work as well.
And the last tip I have for you is to check the dynamic sizing when you upload a web version of the game because not all ppl have the same screen size or screen resolution. if that won't work for your game, I suggest you to just settle for 720p resolution that will work will with most laptop screens and anything else as well.