The little alien guy looked really cute! Overall graphics ok, and having music is very nice. The synth loop doesn't get too annoying at least for the time I tested.
Gameplay felt too slow paced for me. I'd prefer if there were more enemies and maybe more health?
I had trouble making the bomb consistently, it seemed to fail or make the rocket.
Also the tutorial is kind of essential to understand the game, of course an interactive tutorial would be better but that might take too much time in a jam. Maybe at least have a pause menu that makes the same tutorial show up or write it in the description?
Nice take on the theme, I liked jumping between the planets when I did manage to make the bombs!