I got a high score around 10,000 for levels 1 and 2, gave up on level 3. Funnily enough, I found routing level 2 was wayy easier than level 1, which I only lost because I fell off the map. I don't know if the rate of decay goes up over time, or just due to the number of tiles that have disappeared, but I seemed to find a perfect loop through level 2 where none of the remaining tiles could ever decay.
The art was nice, and the level design was great! I saw a couple comments complaining about the wall jumping, but I've got to say the opposite. I thought the controls were tight, and the wall jumping felt natural. Great work all around.