Really Cool mechanics, I liked how you used the alternate camera and the size changing in 3rd person. However like others have mentioned, the camera is kinda unintuative. If it displayed what camera you are on it would help with not confusing "W" and "S". Also I found that level 3 and 4 were not possible without bouncing into a corner near the golden propellor and making yourself really large until you clip through the floor and complete the level.
edit: I stand corrected level 3 and 4 are possible, but very hard lmao