This is a cool idea, but a few things:
1. The jump feels really floaty, if you use unity you can fix that by for example turning up the gravity scale of the rigidbody 2D.
2. You can´t move if you´re jumping. Again, if you use unity like it says in "More information", check out this video:
3.I don´t know what platform your build was, but use WebGL next time, works a lot better :).I hope the feedback helped you. Would be nice if you could check out my game "Square Pair" too. :)