A cool twist of old maze games
I really enjoyed it, great job! I think the length, time-wise, was about right... it'd be nice to have more than one "level" or "map" or whatever for some variety, though.
As far as difficulty, it obviously varies based upon how good your mouse or trackball is, but for me it was fairly easy, but you had to use patience when waiting down at the bottom of the screen for more mapspace to scroll up or you'd hit a wall.
There is ONE little glitch that can be used to cheat. Some walls, like the very very thin one at the very start of the map (just to the left of the entrance), can be slid through so quickly you don't get damaged more than once. Trying to do this too often over the whole course of the map would probably kill you, I imagine, but you could use it once or twice if you wanted to. I don't really know any way you could fix that without some major programming of "walls within the walls" that wouldn't allow movement... but at the very least, the wall there at the start could be extended upwards some to make it thicker, and thus harder to jump right into the middle of the maze.
Aside from that, I found that there were enough wrong turns possible (though some were kinda visible too soon, and thus weren't very tempting to turn down) to make it interesting. Great job, again!