It looks like a good start to a game. The collision detection needs a little work (maybe add a frictionless material to the objects) as I kept getting stuck on the platforms.

The character would occasionally get stuck on platforms, I enjoyed the double jumps, although they didn't always work consistently. I like how you interpreted the theme to make a simple yet fun game.

I liked the theme, I feel that gravity is very light.

I love your take on the theme. the springs sometimes worked sometimes didn't work for me. the music also helped to create tension, well chosen. It would have been nice to be able to press space after I died to restart the game and not to look for the mouse to click the restart. My short summary: the game is simple yet demanding your attention, I had fun playing and getting out, good work :)