This has the beginnings of being a great deck-building rogue-like, some of my own critiques are:
* The game has a major balance issue, the cards which can attack all enemies (especially the scythe) are overpowered especially when paired with 'If Fatal increase damage'. Once acquired the run essentially becomes trivial as that one card can one shot any enemy in the game including the end boss.
* The first mole store shows up too early, before you have ample time to collect food or picks to buy anything but the lowest cost item.
* Frog statues should allow forgetting cards in your exploration deck too.
* Is the map really necessary as a card? All it does is take up a space in the hand and is never used.
* There needs to be a mechanic which can reduce the energy cost of cards, a lot of cards I would consider using if their energy requirements could be lowered. Either that or you could get a 'guts' card when you beat a boss to increase your overall energy.
Overall I think this is a fantastic demo, I've beaten it a few times now and that's just my overall feel of it at the moment.