Nice job! 

I did encounter a few glitches: dying opens a pause menu, which offers "resume" as an option, but if you click this you then have to manually close and restart the game to do anything. Also, I cannot see the enemy projectiles, or tell when I'm in range, so nearly every encounter ends with me losing life. The jetpack sometimes works, but sometimes contributes no upward motion at all, which is confusing.

I think also the movement could benefit from a little speed increase, and a little sharper handling. This could be a really cool experience if it was fast paced, and if you could "read" your enemies, like "My Friend Pedro" or similar titles!

Good work, keep it up!