I love retromine, it's one of the games I come back to play over and over. It does feel like there are only a few viable deckbuilds that can win the game, notably with draw (esp. free), and Gold Mine/Wrench.
I ran into a weird bug while drawing my whole deck that made these placeholder cards that got frozen in the background and couldn't be played. They only lasted that round but interfered with drawing cards or sometimes got drawn out of the deck after a shuffle.