Nice concept and the music was good.
A few suggestions regarding movement. The jump felt a little low, it'd be better to have a high jump rather than a double jump. Also the movement felt very fast compared to the jump. And the player has a tendency to stick to the side of platforms. If you're using unity you can fix this by adding a 0 friction material to the player rigidbody.
For your second jam, this is a nice game and I wish you luck in your future jams.