Sure there aren’t that many cards but those cards are so well balanced. Every single card has its uses so you’re constantly presented with interesting decisions. It feels like almost every other roguelike has dead time where you’re just going through the motions whereas in slay the spire you’re making decisions from floor 1.
Simon’s Quest doesn’t deserve to be called a bad game. The music and graphics are quite good for the NES and the open structure of the game was quite novel and many elements like the leveling system became staples of the series from SotN onward. The thing that really holds it back is the terrible english translation which makes the puzzles way harder than they need to be.