nice job that you finished the game, however I think it could be improved in some ways
1. The player feels slippery this is most likely because you used Input.GetAxis() in stead of Input.GetAxisRaw() which turns the vector 2 to (0,0) when the player stops holding a key.
2. The screen size is too small which causes you to not be able to sees the asteroids before getting hit
3. It would be nice to get a main menu or some hightscores in to make the player have a reason for playing.
Other than that the game was not bad specially for one which was made in less than 48 hours