Ahhh the classic jump game to make sure you get on the right platform. lol that is fun. Interesting approach you did there and interesting concept with 2d. However I ran into an issue on the second yellow part that made him go 2d. If you have it where he goes back he falls off and then he get stuck in the air. This happen on the second yellow one as shown in this picture. 
To add after that, it made it where i got stuck so i had to do the 2 yellow again but i was able to complete. Very interesting approach and it did go smooth. If you try something like this again, might i suggest some moving platform for later levels. Great job on this.