Loved this! Ill nit pick a few things because they take 2 seconds to fix and I would love to see you fix them.
1) The ground check is off, I'm assuming its too close to the bottom of the square so you can only jump if you are PERFECTLY flush with the ground. That needs to be fixed.
2) You can stick to walls. Quick google "Unity how to not stick to walls" It is just a physics material that you make.
And thats it! Obviously with more time would come better levels but the ones you had were not bad at all, great work!