I like the idea of power values, also have few ideas about game and wanna share them:
maybe some unique genes that will take both trigger and effect places (full string gene, like 2 tile step in any direction when move),
maybe to OnEmber also should have immunity to damage from ember with it,
maybe perks at some milepoint given to pick from random pool, like bigger sight range (or it can be a gene) and bigger map (camera chase player, bigger map = more genes, reward, difficulty, harder to find exit, more usefulness from wall-destroying effects)
maybe summoned miniblop should live only for 4 turn?
Potential is enormous!)
I think easily activated genes should stay in some form, making an overpowered build its also part of a fun, but yeah, making balance it's hard and long tread.