Nice contrast in the four colours. The details in the trees make it unclear as to what such objects are. I assumed that they were all nests, yet once I collect a certain number of whatever is in the trees, I just end up dying.
The upwards movement is also very unstable. The simple act of moving up a tree causes the squirrel to move at a slant, making the journey upwards more difficult than it should be.
I mean, it is an interesting premise for a game. I don't really see that many games about squirrels, and this one's got some nice backgrounds to it as well as the squirrel graphics. It just needs more stable controls and a clearer objective. Because as of now, it seems you only wander aimless around a given area until you get bored and die. I'm looking forward to the continued polish. (ps add some sounds too! :) )