This is a cool concept, though a bit difficult.  Visually I really like the palette, but I agree it can be slightly hard to internalize that you cant jump on the platforms if they dont match the background color (I think cause their interior color / borders are still solid, maybe a dashed border or transparent interior might help).  I'd love some indication for how many jumps are available too.  I like how the first level introduces you to the switch mechanic safely by forcing you to use it to get on top of the large box, but I think the difficulty ramps up quickly with all the wall jump puzzles (I only got to the T shaped one).  Some hang time or slowdown while wall sliding could help.  Theres 1 slight issue with momentum when running.  If you just let go of the direction you come to a stop really quickly which is good, but if you instead press the opposite direction, you slide for awhile before building up enough speed in the opposite direction to actually start traveling that way.  To combat this, apply that same no-button brake force when the input direction is the opposite the velocity direction.  That should make that level of control feel tighter.  When it comes to music I think chip tune felt the most fitting to me, I think it pairs well with bold colors and style.  I think theres alot you can explore with this project, and it already feels pretty good. 

It took me a few tries to realize that I had to press up arrow key multiple times. It's also very confusing when the platform is there visually but not land on it and it gets very annoying in later levels. I have seen a few games like these in which certain platforms just blend in and disappear on changing color so you can't land on them.

But nice work overall. Good luck! :)

Really nice puzzle design here, and I liked how clear the visuals made things. nice work!

I Enjoyed it. You have a really good thumb nail.

This was quite cute, but I felt that the controls were not always super responsive! Have a look yourself at my video review: 1:05:40 Jump Switch