I like the idea of switching between two characters, since that forces the player to switch up their playstyle, though I think there should be more incentive to switch between the two characters. Right now there's like two meters, one being a timer for how long you can stay as Warrior and one for how long until you can switch back to Warrior. I think this could be just one meter that's treated as a resource meter, so you can switch back to Warrior at any time even if the meter isn't full, you just wouldn't be able to stay as Warrior for as long if the meter isn't full, so the player would be incentivized to switch back to Em so the meter can keep charging. Cool concept though, there's definitely room to flesh this idea out!