A couple of issues I noticed: 1) I could control the fox with WASD, but when I go into other entities, I can only control them with the arrow keys. 2) The camera in the room with the rollie pollies is tricky because it locks to certain areas for some reason, and if I understand correctly I need to jump left to break the one wall to progress with the bat, but I'm jumping outside the camera area and can't make the jump, 3) when I tried to make a previous jump, the fox did this little hop which did not allow me to make the jump, but then I realized I had to backtrack left and could barely make it through the light - this could have been explained (or it was just me). 4) When I go into the bat, then leave the fox and go into the rollie pollie, I end up controlling both of them, even though I'm no longer in the bat.
Just some critics, but overall I really like and enjoyed the ideas you've implemented! I think with some fine tuning and polishing this could turn out an amazing game! Good one!