I like this interpretation of the theme. It is appropriately hard to control.
The tone is very zen and appropriate for calming the player during the frustrating (but fair) difficulty.
I wish it were a little easier so I could have gotten past the second level. I would love to see what other levels you've made, but couldn't surpass the blue folders. Perhaps make them have to get a bit closer to capture the mouse.
It was also a little hard to tell where the mouse is allowed to go or not. The edge of the trees are nice, but you're allowed to go a little into them, making it hard to see the boundaries.
I think there's a lot of potential for great (if frustrating) puzzles/levels. Overall, great skill game. Just a bit too sharp of a difficulty increase.