Unfortunately this game is unfinished so I can't judge it properly.
Please understand that the low ratings are to help sort the submissions and do not reflect that I think this game idea would have been cool if completed.
You should not be discouraged by this however, you've already made amazing progress just by attempting and it is clear that some mechanics have been implemented (random generation, enemies shooting), showing you have the skill to make a game. Keep learning and improving, next year you can (and should) try again!
Good luck