It may look bad, but this game started the entire 'roguelike + deckbuilder' subgenre. Slay the Spire, Monster Train, etc. may be more polished, but this one's still worth playing and is less afraid to go completely nuts with its concepts and numbers.
This game used to be really fun in hotseat multiplayer. Combat-focused heroes do tend to get completely ridiculous and unkillable though, so the balance it kind of janky.