Hey I really liked your game and if you like to read them here are some things that could be improved(obviously just my own opinion):
- a health bar for the boss enemy( i was never sure when I beat it),
- asteroids seemed as if they were obstacles :D (I think this was already mentioned in a comment)
- a indictor on how many bombs i have left would have been amazing,
- obviously more content(not your fault, i just want to play more :D)
good job on this