The art is BEAUTIFUL. A little feedback for your future platformers or updates: Don't make the ceiling lower than the jump! It can be frustrating to collide with it trying to move. Work on measuring distances and make the platforms feel good. You could also add checkpoints so there's no need to restart from the beginning and if you really want to give it something else, add a complementary mechanic to make things interesting!
Overall a really good entry and a very impressive "first game ever"!