I FIGURED OUT WHY INPUTS DON'T WORK: (i think)
If you click the sides of the game, inputs (and potentially audio) will stop working. Going to a new tab may also make inputs not work anymore except for left click. Note that I'm running Firefox.
Anyways...
This game looks great, love the pallete choice and the clean visuals. I love the no outline style here. Music is pretty nice too.
A small detail that I really appreciate; I love how the shooting things on the first few screens sync up with the music. I could actually time my fall to the music, and I wouldn't get hit.
I did have some issues with gameplay; when I died I was sent back to the beginning. Then I have to retrace all my steps again. This, combined with the slow movement speed, made it kinda tedious to traverse the world.