I wasn't really sure what to expect playing this but I was pleasantly surprised. It's simple but addicting due to the mechanics and increasing difficulty as you move to the next level.
I really like how you've used the switching mechanic and how you need to use it in different ways like in combination with box platforms you need to move around (or the coloured keys you search for). The art style is nice too and so is the background music.
The jump you have to make here too me a few attempts and that was a little frustrating having to go all the way back around... but maybe that was me? it felt like there was a slight delay between jumping back into the paper so I missed it but I could also just have terrible co-ordination.