Lol, some of the collision boxes could use some work, and possibly the option to collide with some entities and not others (didn't quite parse the phyics layer system in the time alotted, but it seems like the likely solution).
Thanks for the feedback and the heads up on the bug... There are a couple of interesting interactions the player can have with the animals' colliders. Maybe we should have turned the bug into a feature, and given achievements for finding all the ways you can glitch it out :P
I'll be be sure to rate your game shortly, thanks for commenting!