thanks for the report.
This overheat issue happen because I tried to find a way to limit mashing without using torso turning. This is a bigger problem when using weapon like swords or chains. What I did is increasing a fixed amount of overheat for each arm extension. But it's not perfect as it's rather inefficient at normal time and can be exaggerated in slow motion. I'm still looking for a better solution.
About the colors, I don't know. They're a max of 4 players at the same time, so to me it makes sense to limit at 4 colors. There is also the reason that more colors will be less distinctive. (like orange would looks too much like red, or unused weapons).