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1. one is not allowed to wake more then 10 evil eyes, otherwise one wil get eaten.

2. its possible to get to the checkpoint at 20,21 by waking only 3 evil eyes (northern route). taking the southern route wakes 4 evil eyes, and the middle route wakes 6 eyes. I wonder, which route is the best....

×1. Correct
2. There's also a less obvious path which wakes only 3 eyes. I got to (20,21) with three eyes awake.
3. Yes, I went through (17,11).

×Your first assumption is correct, 10 is the maximum number of eyes you are allowed to wake up when going through the maze.