Good game. Solid concept. A bit boring in execution. The reason you get a 4/5 is because level 1:11 seems to be impossible.
I don't know if you are evil or if you just goofed up, but I threw together a screenshot to illustrate the problem I am having. Here are two links to said image, hosted on my dump and on imgur:
(As always, be cautious with links, make sure to filter out the random spaces NG will insert.)
I'll PM you as well. Other players beware!