Initially I was very turned off by the look-and-feel of the game. It takes "retro" to a whole new level. But the gameplay is very unique and interesting! And for me, that trumps the look of it. Essentially you travel around a loop, and you get to place cards from your hand on the board that create monsters or add effects to the loop or surrounding area. Your character auto-battles the monsters he encounters, and you collect weapons and resources.
The weapons are good for the loop only and make your character more powerful, with the loot specific to the character you pick (apparently there are 3 you can unlock). The resources upgrade your camp back at base, which gives all your characters long-term benefits (for example, the first unlock lets you heal an extra 10% of your life each time you finish a loop).
I like several things about the game. There are several secrets to unlock. Minor spoiler from the first secret you'll probably unlock:
Perhaps the part of it that appeals to me the most, though, is that the game isn't too hard. Most roguelites for me are just too difficult. I know I'm never going to beat them. But this game, while still very challenging, seems like something I could ultimately beat by just keeping at it. For me that's a big plus. In the demo I was able to unlock healing potions and special abilities for leveling up, and both of those added a ton to my survivability. I'm really looking forward to getting this game, so I'll give more info when it unlocks on March 4th, but in the meantime I'd recommend the demo if this sounds interesting.