It took a while, but I decided movement would just work more or less the same way all the time. Characters can move a certain amount of distance in one move, and can move a number of times decided by their movement level.
I tried to work it so they'd be able to get clear of their own bombs easily, though the way I made it, a fast character can just zoom all over the place.
Maybe balance it by having one action per character at a time until everyone's used their actions in the current round, or something?
Since players can kick and throw from the start, they should be able to avoid blowing themselves up. Positioning themselves and each other's bombs becomes part of the puzzle solving process. I kinda like how the stronger a character gets, the more they can do, but the more they have to think as well.
Anyway, I added the Movement paragraph under Campaigns and Gameplay, so if anyone has something better go ahead and just change it.
And unregistered guests, that includes you! Go nuts with it.

I don't plan on making a full ruleset, I'd much rather see other fans come together and have fun with it.