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Great concept. I'm a fan of ingenuity, so congratulations on this game. My score was 31/442 at the end. The only issue I had was the sliding doors not resetting after I hit a wall, so they were still closing even when I passed through their trigger. This was only a problem on a couple of levels, but I'd squeak in between the wall and the first door, only to have the second one finish closing as I entered the space.
On the plus side, I finished level 10 by blasting between the corner and the door when it was less than twice as wide as my O-Ring after resetting from a collision, so if you reset all the doors I'd have had to try level 10 again. <img src="smileys/smiley36.gif" border="0" align="middle" />
Keep up the good work. I like your creativity.