As was said below, the slipperiness of the character makes it easy to ramp up to speeds way too hard to control. The level design is really cool, I love the use of an underground cavern structure. The ladders, however, don't really function as "ladders", as in I can't use them to go back up; adding that functionality would be much easier to navigate the level. If you were to add on to this maybe something in the sky to contrast it? Also I noticed that when moving there are this flashing blue lines between the objects your platforms are made of, maybe some sorting layer issues you would want to look into. The art is cute and fitting, but I believe these are premade assets? I remember seeing them in some tutorial videos. If this is taken further I would love to see your own characters and art used to give it your own personal flair.