Don't see why it needs to be made separate or how its a different game just a mode to play. It would just be using the core mechanics of the game and reusing assets and dungeons. Just a suggestion I'm not demanding. I just like the combat and feel like this would give the game more to play with out playing the same fights over and over again. You know face different enemies in different situations. Besides plenty of games feature different modes in them that have nothing to do with the campaign. Like arcade modes or just wave modes where you fight endless waves. Inscryption had a developer made mode that focused just on the first chapter of the game and made into a roguelike deck builder because everyone liked that part of the game.
