If i get the rules correctly, every time i player sell oil or make pv with gas, the cubes go into the bag. I was wandering if during the design phase was thought / tested the possibility of putting back in the back just gas cubes, of course starting since the beginning with more black cubes. That would add to a thematic feel of a reservoir being depleted - usually gas to oil ratio goes up with reservoir life.
I am also curious about another design decision: why have you decided to replenish reservoirs just when oil is completed and not oil and gas (so all the cubes)?
I had my first 3p game yesterday and i enjoyed the game pretty much! I am eager to play it with 5p i suspect may be a cuttthroat of a game!!