Overall a worthwhile game!
9/10
2 things I have to say. (I couldn't make anything like this so I'm giving you the benefit of the doubt.)
I would have either made the top section easier, or the bottom section HARDER (I suppose I'm referring to the mutations). Basically I had one foolish struggle on the top path, and blazed thru the bottom path. If you don't I would designate the bottom half EASY and the top HARD. I can't Count you down for that I'm sure this wasnt your intention at all!
Also... I quite often died at the hands of the pointer going of screen, so with that the only thing I can think of is an option to switch between arrows and mouse, OR to add a full screen as to not allow my mouse to get off track. That my friend, is the only thing I can count you down for!
Other than that its obviously an impressive game, I keep coming back to play it again!
~DJM