This game's central concept is really good. It reminds me of the old flash game This Is The Only Level, where you have to go through the same level layout with different mechanics. This game also shows off the joined together controls very well, especially with the first sign.
The main problem is the level design and the player physics. The level design asks for a level of precision that the player physics can't exactly give, so it turns out a lot harder than it needs to be. Tightening the controls is an easy way to fix this.
Also, as someone else mentioned in the comments, the premade assets haven't been imported or resized properly and wind up blurry, even on the recommended full-screen mode.
Still, despite that, with a bit of polish, this could become a really good game in the future.