80% of runs are lost in the first round - if you don't get the 2x ore required each turn not much point in playing on (you'll miss out on the +1 turns). More restartminer than retrominer. It's not so much 'a difficult game' as an unbalanced one - if you can tweak the balance I think it would be great, but right now most strategires and combos are irrelevant, they are overwhelmed by the "play it exactly one way or else you are guaranteeed to los", making it more of a puzzle (second-guessing the designer's preferred combo) than a game.
Love the downvotes. If you do the maths, most cards in the game are completely useless - because of the artificial limits there is a very low maximum number of turns that can happen, a very low number of reshuffles that can happen, which breaks most cards (they would work fine in a normal, non-limited, game). Only a very few actually scale as fast as the game increases the required limit - if you stick it in a spreadsheet issues like this become much easier to see.