I really liked it. There's lots of things you could add to it too. Inventory system, ways to make water, automation, jumping ;). I'd love to be able to have like my own space garden just for aesthetic purposes too, so some stuff just for decoration etc.
The radiation feature wasn't really for me I don't think, it was kinda stressful and I'd personally take the game down a more relaxing route but could see it working both ways.
Overall I enjoyed it a lot and ultimately was left wanting more which is a good sign for a jam game. Well done!