Geez, that was difficult, lol. This was quite a unique platformer, and one of my favorite takes on the theme! I certainly fell more times than I'd like to admit, but I persisted through and felt like by the end, I'd gotten the hang of the mechanics pretty well. The art and level design were also nice.
One thing I thing would have helped the gameplay flow a little smoother would be if there were some kind of visual indicator of where the chair would land after I threw it. That, or perhaps the ability to only erase 1 chair rather than all 4. I suppose part of the point of the game is the challenge, though, so take my suggestions however you will.
Great job! The challenge was rewarding, and I had a lot of fun!