Fun and challenging game. I really like to look at it, feels like it could be an older game and that's a big plus for me. The music was fun and engaging, also the option to change the color palette in the menu is a nice addition!
One thing: When I pressed left shift, the game pauses/stands still ? Pressing shift again does nothing tho. That happened right at the start, so I thought it maybe crashed, but I was able to pause the game this way in any stage of the game. Music is still playing, but nothing moves. Its not a big problem, I just reloaded the page and could play it and had fun, just letting you know in case you want to fix this, because its a cool game! Good job :D