This is an interesting idea. However, the usage of the theme felt a little weak. And, using the shrinking was awkward with the WASD movement. I think rebinding it to a mouse button would be a better idea. That one change would definitely make the game much easier to play.
With that aside, this game reminds me about the time I spent playing impossible cursor maze games. I liked the x-ray ability of the cursor, and I feel there is a lot you can do with that in conjunction with the shrinking.