This was fun! I like the control scheme, and using different speeds for the different characters actually adds to the strategizing since you can do refined movements with the faster one and give overall rat direction with the slower one.
A small bug I found was where if you only skid the rat, you get a point but the rat isn't caught, leading you to easily get a higher score as your guys are still pretty close to the rat. Maybe the points are not tied to rat deletion/reset?