Mana Spark is supposed to be a potent metroidvania, but I overdosed on those and find almost all of them mediocre nowadays.
I much enjoyed Dungeon Top, which is a sort of board game with roguelite trends. Definitely worth much more than a buck, or half a buck even in my opinion.
One Strike is fun for a few rounds of 2 players versus play. It is a fighting game where any blow is lethal.