I loved this! *-*
The idea of climbing the rain droplets as they fall is something that exists in the common imagination, but I've never seen a game offering the same experience. And that fits so perfectly with the theme! Incredible work of game design, congratulations!
The 3D graphics of the wobbling giant raindrops is amazing, and the way they physically interacts with the player feels very real; I imagine it wasn't easy to reach this result!
On a practical level, I found this very very hard :( The space bar and the x had a clear result on the character, but I could not understand how the arrows were moving it. I could see some effects, but were they relative to the direction of the player, or were they relative to the world? Unfortunately, I was unable to reach the end of the first phase, and that's sad because - reading the other comments - there are wonders up there! :')
Besides that, congratulations again for the game, I enjoyed it a lot!