I love the base concept, and I'm excited to watch the development of this game, but I have a few concerns that I hope will be addressed in the final product:
1) The difficulty - I think it's excellent that this game is so simple, but manages to be so tough. That said, the dramatic increase in Score required to beat the later levels means that there are very few strategies that actually stand a chance of winning and there are many *many* cards in the shop that are simply a trap.
In most deck-builders that I've played, the base difficulty is approachable with a variety of strategies and allows the player to experiment with building their deck, while there will tend to be higher difficulty modes (like ascensions in Slay the Spire) that require the player to plan out their strategy more carefully.
2) The pointless cards - This is an extension of the first concern, which is that there are many cards currently in the game that do not justify their inclusion in your deck (Ex. Smeltery is just a worse Fruit Bat, Anvil has far too much opportunity cost for the effect it produces). I'd love to see some synergy for animal cards or Tools, but as it stands now there is little reason to play anything other than the most efficient card draw (Minecart, Helmet, Ingot) and big Resource cards. Everything else only dilutes your chances of drawing the cards that actively win you the game.
3) The map - This is definitely personal preference, and not something that would make or break the overall game, but I feel that the map should be more than just flavor. If there were branching paths, that could alleviate some of the difficulty concern. Additionally, I think it would be interesting if the cards offered in the shop were influenced by the region (Ex: more animals for sale in the Buried Forest, or more Tools for sale in the Magic City, etc.)
I want to reiterate that I think this game is awesome, and none of these issues have dampened my enthusiasm to see where this game goes. I'll be following this one closely. 😁