Controls struggle a bit on the Web for me, for example up and down tries to scroll my browser! But I can see this is a beautiful game, moves well, enemy patterns and logic seem challenging and even with my problems I can see this being fun.
Thank you! Ye the scrolling thingy is annoying but can be solved by using a different browser like Firefox. There used to be a fullscreen button but it magically disappeared when i changed the Emscripten template :/