Hero Siege 50% off. It's similar to Binding of Isaac in that you clear levels and collect trinkets that provide various benefits, although that's about all that's similar. Combat is far more dakka than tactical (especially in the sense of consumable items). There are, at present, four classes, each with their own combat style and skills that you invest in as you level up. Although you have only one life (baring trinkets), level and certain other investments are carried over between lives, while trinkets and temporary bonuses (purchased with gold collected) are not.
It feels like a lot of its mechanics are lifted straight from BoI, but the balance is weird. Some items are absurdly powerful, some are just useless - the skeleton key, for example, grants 99 keys, but I am literally never out of keys. There's a sai item with a short (~20 seconds?) cooldown that adds thrown sais to your default attack and it can basically kill a boss in a half second flat. There's at least one boss that's instagibbed me every time it appeared (even when I had ~5000 health, where the norm is ~500), because its been summoned in extremely cramped close quarters in a dungeon but has four huge orbiting heads that deal large damage every frame.
It could do with a "collection"/achievement thing page as in BoI. It's an okay game for 5 bucks.