For your first game, it's pretty good!
That music sounded cool, though when repeating for the 100th time, it kind of gets annoying imo. Some sound fx would have been a nice addition! Please reduce the camera's near clip from 0.3 (default) down to 0.0, because when you're close to the walls, the camera clips through on the edges and that's weird. Also, I don't know why you left drag on the player, maybe to simulate otherworldly gravity, but it's not such a good idea when you jump from one platform to another, something (i think it's drag) slows you down you in the air, and you fall before reaching the next platform. Always play-test your games, and ask multiple friends to play-test it as well. They will notice things you (the devs) missed. Cheers!