Pretty cool game mechanics! You have trampolines, ladders, and moving platforms which you combine to make some pretty clever courses! The sprites are also pretty good. One thing I would recommend is adding animations. Just something as simple as animated sprites would turn this game from a basic platformer to something that looks and feels quite professional.
I did encounter a glitch on level 3 or 4 (I don't remember which it was, you can see the screen recording) where it would restart to level one instead of restarting the level. Small glitch, should be easily remedied :)