Very fun game, got 4 batteries replaced in the end.
As other mentioned, the controls take some time to get the hang of. Some sort of assistance would make it easier for new players. You can then award some bonus point if the player managed to not use the assistance.
The gameplay can be extended by some skills, something like a speed boost, a brake, or a shockwave that pushes the asteroids away, or some shield to protect the player against it. Anyway, I understand this is a game jam submission and time is tight, so these are just suggestion not critics.