I think, the most glaring issue with this game is that most cards feel like underpowered versions of their Dominion equivalents. Paradoxically, the game requires you to purchase multiple Provinces per turn in the endgame—which would still be a winning move even in Dominion with far more powerful combos.
Currently, only a few overpowered cards, such as Consume, allow you to break through this final threshold. This makes me feel quite impossible to win unless you happen to find those specific cards.
One more thing I want to mention is that the starting pool is guaranteed to lack any of impactful 5-cost cards. Whenever I have 5 golds in my hand in Shudderwood, I just don't feel very happy...