Pretty good - I think with some more polish and some of your own art, you'd have a nice game. I enjoyed this though as a basic platformer.
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I have tried to make some artwork (pixel art) but this is not my area of expertise.
My girlfriend and I have talked about that she might join at some point and she is a professional artist. I hope that she one day will take one of my game and replace the artwork from Kenney with something good.
About the polished then I agree with you. The code that generates the terrain need more attention and I should have added more enemies in