I just sent a build of Chessplosion's upcoming game mode to my patrons over on Patreon! It's called Gauntlet mode, and it's like if Dungeon mode was an arcade game instead of an action roguelike. All action, no upgrades or backtracking, and a scoring system that rewards you for quickly clearing rooms and chaining hits on enemies.
I'll try my best to release it to the public soon, but between polishing the menus and getting the text translated into nine languages, it might be a while before it's ready. In the meantime, I hope patrons enjoy it!