I like the gravity manipulation idea, the game overall great it is interesting, maybe something to show whether my gravity is on or off cause occasionally I don't remember if my gravity is on or off until I jump again. 

Great little game! Simple idea but excellent execution. You might consider to implement a highscore display to encourage players to keep striving for better socres. 

I really want to see a "Remake of Floating Astronaut" in future.

This is the true idea of Game Jam games! Should be simple and fun, for a newbies game jam I think this really shows what areas you mostly practiced in programming and game development in general.

Please continue to work on small but serious projects in different topics/areas to achieve the knowledge of game developing, and in future you will be able to create much bigger projects!

Liked this game simplicity, a simple time killer

Interesting concept. Nice game.

cool your game, simple but very beautiful graphic, congratulations