Not sure if the Windows build is broken or I'm missing something, but I can only jump (I have clicked everywhere in the window, no shooting happens). The window is also EXTREMELY small and doesn't seem to be able to be resized.
The music, sounds, and art are very well done. The background especially has some nice colors and the overall tone feels really nice and chill.
The gameplay is a bit basic. I wasn't really a fan of how I couldn't control my jump at all, and you moved so slowly that it was difficult to judge distances. I think it would be better if you could jump higher/lower based on how long you hold the jump tap/button.