Nice game with good visuals and audio)
A bit unpolished (if you swap when you are in the inactive block, which became active after swap - you'll be pushed up, that makes game a lot easier) but still good.
My only remark - as unexpirienced platformer player I found that holding jump makes it higher by accident, I think that such type of mechanics better to explain in tutorial, which is in onter things you made really great and absolutely clear. Good work!