The level design is cluttered and not polished at all. Sprites are the usual game maker bunch nothing too special. Controlling your character is very difficult and death is nothing but a burden having to jump through hoops to restart the game in the browser.
I recommend you take some time to develop a game that's rewarding, something that makes you want to progress to the next screen. If you choose this type of layout start small then make a mess later on. Try looking at more puzzle games and study how those work, even the most basic flash games have had success just by creating short stories and interesting mazes.