Yeah I really spent too much time building an expandable combat system, which I didn't even expand it much after I realized that the mini-games should be the core part of the game, not the combat system.
I actually had some ideas to make some of the lower-cost actions situationally better than the higher-cost ones. For example, the Gunslinger was going to have a reload mechanic, where if he run out of ammo, he has to not collect any energy for him to use his reload action.