Again, I do think it's fine to have stronger and weaker cards/strategies.
If you wanted to even out the overall power level (while leaving some things stronger and weaker depending on the situation)
These are the changes I would test:
Axolotl - current effect + draws 1 card
Screwdriver - cost 0 energy for current effect
Corkscrew - cost 3 energy but gives an absurdly large buff, like +7 or +10
Aquifer - current effect + if you only have minerals in hand +2 energy
Jebroa - cost 0 energy, give a random resource +3 (or even +4) then discard a random resource
Scorium Pandorite - (but not Ore Pandorite) either current effect + cost 2 energy or at least current effect + premium price in shop.
Katzite - cost 2 energy + gives bonus equal to its own resource value for each prior mineral (so you can scale the bonus).
Ingot - current card + premium price in shop
Amber - current effect + cannot be upgraded beyond 30
Cave Cat - current card + cheap pricing in shop
Compass - current card + cheap pricing in shop
Pet Mole - current card + cheap pricing in shop