This is like a fever dream! I finally kinda figured out kind to play (all while laughing and saying wtf to myself).
I think you should change the instructions from saying space key to "jump" to say "flap" or something as the controls are more like Joust or Flappy Bird.
I got stuck in a building and got all the parts and killed all the enemies in there but couldn't figure out how to exit the building and slowly went mad due to the repeating atonal melody of the building music. But now it's stuck in my head for eternity. I'm not making it home to my planet but I'm at peace with it.