Haha, nice, that ending though.
Sorry, it took me so long to play; I like it, though! I thought it was interesting how many similarities our game shared as well, especially the narrative!
I did find myself missing some kind of navigation assistance (map, arrows, compass). There were also a few bugs that I am sure you are aware of; occasional invincible zombies in the bridge, the boss sticking around after you die, and keeping items after death, even though that may have been a design choice. After I realized that was a thing though, I did use "return by die" instead of fighting my way back through the enemies after I collected a crystal.
Also, I think after you defeat the boss, it should automatically trigger a transition back into the ship! That was sort of awkward the first time I ran into it.
Really well executed in the jam time frame, though, and fun! I like all of your incorporations of the themes. :)