lots more work is needed

sorry this game just didn't cut it for me. I'll give you creadit for an original idea but personally i think it has alot to be desired. for one your graphics was very basic. cleaning up the sprites would ba a key area of focus aswell as the programing. Use jump commands instead of move commands. they have the same visual effect but it alot cleaner and allways for diagonal movement. you can find this in the scrolling shooter example.
other than than sounds and more lvl's are needed. work on difficulty lvl's and specialist level's. mayve even spawns for the wood. maybe put mazes into it aswell to make it more difficult to dodge and get to the exit.
next would be the story. assuming ofcourse you have one, either way the games perpouse needs clear statement.
A good idea would be a main menu aswell. look in the multiplayer chat to get ideas for buttons using sprite reference and stopping the animation speed of a sprite.

It would be an extremely good idea to be looking into the programing side of game maker. this will help you understand how it all works plus give you more flexible options when it comes to functionality of game maker.
good luck i hope this helps somewhat in the development of this game.