Very nice game ! The world switching mechanic is the same than the one in my game, but with way more effects, I love how we got the same idea, but you made a way more complete gameplay loop than me aha.
The graphics are very nice, and the small blob teaching you the mechanics by saying the key to use on the first levels is a nice touch.
I didn’t get what the gems are for though, when I missed some I could get to the next part of the level and there was no score.