Super fun game with a cool story behind it.
Feature suggestion: Maybe a way to end the day early if i get back before running out of oxygen.
I found that if you kept hitting an enemy while it was dying would just keep playing the death animation in some cases.
I also didn't realise I had an alien to upgrade so I'd spent all my gems on my human upgrades and lost pretty quickly on the last day. (oops) Somehow it still said I won so I'm happy. :D