Honestly, I've found it quite charming!
I like the uneasy atmosphere you have here of something dream-like, similar to games like Yume Nikki - a big part of it is the music, it's simple but really evocative. The idea with placing spinning platforms is interesting and implementing such relative spin mechanic as not only your first game project, but in a jam game as well is quite impressive!
However, you might want to give the player a hint that they are supposed to find and cross a green finish line and the game will only become actually interesting if you add some challenge(if falling off platforms makes you restart the level/you have limited platforms to place in build mode).
But again, I really liked the atmosphere, and it's a very strong first project.