This is fun. The two characters have good differentiation between what they can do. The art is great.
I do want to express one point. 1. Bob and boxes are the only things that can weigh down pressure plates, therefore both are heavier than Mike. 2. Mike is capable of pushing both a box and Bob at the same time. Conclusion: Mike is jacked, and could rip the evil robots apart with his bare hands. Bob didn't have to die.