Was a easier than expected,
The only thing that bothered me was that midgame, when the oxygen isn't an issue anymore, running back to the base for upgrades was rather bothersome, wouldn't mind if you could use rocks to buy a minecart/rail... if there was another work station on the left and to unlock the ability to place the rail down, you'd need to reach end of a segment first and make sure the leftmost column is hole-free so that you can place the rail