Hi, I just played through 25 days in survival and I really like the game. I thought I'd give some suggestions although I'm sure you're thinking about some of these ideas already :)
1. Make yellow plants do something. Unless I'm missing something, they seem to be the only thing you can harvest that doesn't give you anything.
2. Once you have the jackhammer you shouldn't need the shovel any more. It seems odd that you can mine the big boulders with it but not the small ones, yet you can harvest plants and ice with it. It feels inconsistent. I'd suggest it just be a replacement for the shovel, able to harvest everything you have so far.
3. Need more uses for rock and scrap metal, I ended up with hundreds of them and nothing to use them on.
4. You should be able to become self sufficient, everything that is found on the map should be producible even if it's difficult or inefficient. For example:
- Maybe farm shouldn't need new seeds, or should produce seeds reliably in addition to plants, otherwise there's eventually a limit to how much food you can produce.
- Water condenser structure to extract water from the air.
- Deep mining structure that regularly but slowly produces rock, ore and radioactive materials.
5. Either upgrades to all existing buildings or better versions you can build.
6. Other things you can spend suit power on?
7. Something to do with your lander module. It just sits there and takes up space, maybe you should be able to recycle it? Or use it for something?
8. More cats! If you're going to call it MewnBase, make the character look more cat like (little ear shapes on helmet, cat-like nose, etc). Maybe little cats could spawn in your farms and prance around or something. i don't know, just more cats! :)