Hi Jono!
Glad you're liking it! Thanks for the suggestions. Here's some quick thoughts:
Day/night cycles: fair point - day length is pretty short at the moment.
The rate that you burn through O2 and Food is something I'm still tweaking. Right now it's the main thing that can kill you (the challenge of the game) - so maybe once I can add in more stuff that can kill you (e.g. meteors, building disasters, and other hazardous terrain), maybe can make the air and food supplies last longer so that it isn't toooo hard haha.
Eventually I want the ability to upgrade your character to hold more O2, maybe craft better food that'll keep you full longer etc.
Some sort of map/radar system (something to help you find your base) is definitely something I'm still working on.
Thanks again for the support! Cheers,
- Steve / @cairn4