Certainly the most unique game I've seen in the jam so far! Really neat concept- like a rain simulator~~ Really nice prototype with a lot of potential to go in many different directions, I think!
Some of the mechanics aren't completely clear, e.g. what makes you absorb rather than be absorbed, but I see you already plan on making some changes. I think it would be nice to have a clearer indication as to what gives you a high score - I assume absorbing more rain scores higher, but I wasn't sure if where I landed made any difference.
I really like the concept of weathering an alien planet. I think you should play into that more! For example, depending on where you land and how much water you have when you do, you could have an effect on the terrain/biodiversity of the planet itself. I also like the idea of the planet having strange, unknown physics. I think you could do more with that, too - maybe even have different levels with different physics, weird antigravity areas of the planet or something ^_^