Sometimes when walking on the wood blocks the character stops walking. I think the blocks aren't perfectly aligned so the character reacts to is if it was a wall.
Also the gravity is a bit to high in my opinion. It feels like he should fall down slower.
The level design doesn't seem to make any sense at all.
https://www.youtube.com/watch?v=ZH2wGpEZVgE
This video will show you how to put together levels so they make more sense for the player and give them a better experience.
Also add instructions and a menu button. Those are important. you can also add sounds and a level selection but that's not as necessary.
It's a good start but you still have lots of things to improove.
Hope this was helpful, and try not to take any offence. I'm only trying to help you.