Very nicely done! I finished the game but I suspect I didn't really plumb its depths -- I was mostly running around with my fox with the other two trailing me. Some comments to help make it even better:
The controls are a bit awkward. I think it would play better with a gamepad and some kind of auto-aim for the pouncing (or even use the second stick to aim).
The footprints were hard to read as the color gradations were too subtle for my eyes.
And personally I wished that the extra foxes had some kind of influenceable AI (e.g., hunt same target as me, block exits, scout map, etc.) rather than direct control since I found this hard and distracting from the tension of the game.