The rain sounds very pleasant to me. The music stutters at times, and I find the sounds you hear when the character stands on a platform very unpleasant. I like the game itself. I would recommend adding full screen as an option.
Solve those issues and add ful screen as an option and I will enjoy playing this nice game!
I think the rain sound and the music are enough. I guess the sound you hear when the character stands on a platform is just supposed to appear when you walk.