I had a lot of fun playing it! The visuals and animations are great, but the audio is pretty basic.
Level design and gameplay works really well. Very good job on balancing levels so that there's a clear path, and only one path, that you must take to progress. I only found one screen I could skip by following what seemed to be an unintended route. The levels before the final area are quite forgiving with how far you fall down, which I believe is good for the pacing of the game. The difficulty scales well as you progress. I also really appreciate the one checkpoint in the final area. There are also some parts with conveyor belts that are very hard to time because you have to be on the ground before you can start charging your jump.
The use of rain as a gameplay element is a creative spin on Jump King, but from the perspective of someone who never played that game it seems like it's otherwise mostly the same idea. I wish you used more puzzle elements involving the rain, such as the one part where you block it with a gate by flipping a lever.