You are correct, fatigue damage is flat and increases exponentially. After 30s of timeout damage it will deal Infinite damage to both players (that will make you win, as it favors the player on draws). I think that increasing the timeout timer a bit will be good to give more room for units to scale and build up power, poison, regen.
I'm thinking about a revamped crystal upgrade screen, where you have sort of a skill tree to "awaken" perks. That should allow making the crystal feel more unique, as currently they are just regular units that can't be discarded.
The default game speed is actually 2x, as I'm still testing in which speed the game "feels" better.



