Wow, was really fun ! I like the 2D/3D during the platformer phase, and the spaceship bits is also fun and chill. The musics are great, spent a good time on it ; and the jumps are satisfying, usually it can be annoying when I'm on the edge, I jump and move forward and it doesn't jump, and in your game it's great because when you're on the edge, you do the jump while moving forward. Maybe one improvement there could be is to increase the astronaut speed, just a little so it can be more energetic.