Very nice! The art was very impressive, one of the best games from the jam visually. The idea was also quite good, although I never quite understood fully all of the mechanics (I think), even though I beat it. I could see you're trying to keep some kind of balance and that the plants give the planet some oxygen, but I couldn't see a very obvious correlation (the planet's oxygen increased seemingly at random to me). I also wasn't sure why you had two types of plants and enough soil for all of them. I'm guessing one takes longer to grow but then provides more oxygen, or something like that, but it wasn't too clear. Obviously these are all things that are hard to get right in 48 hours, so don't take it badly, I'm just providing constructive (I hope) criticism :)
Either way, this was really impressive and I think it has loads of potential, keep at it!