First thing I thought was "Wow this a really nice menu!" and then saw your comment that you had a lot of fun with it. The monochromatic color scheme works really well for the vibe, and the music and sfx you chose fit nicely as well. The level design was really intuitive, I never felt lost. But, an indicator for when gravity is about to switch directions would be nice, or just giving players control over that. All in all great game!