It's basically a dungeon crawler with this Paper Mario-esque aesthetic. Part of the charm of these games is it plays completely different every time you play it depending on what items you're offered and choose to take, and the randomly generated rooms you're given.
You get random upgrade choices as you go, unlock new playable characters, unlock new abilities, etc as you go. It's got over 100 items that can be modified and upgraded, over 80 unique trinkets, 10 bosses, 30 different enemies and tons of unlockable stuff. Plus they've got Ridiculon doing the music from the Binding of Isaac series, which I really enjoyed.
I watched a couple streamers play it earlier for a few minutes, it uses this puzzle game of sorts to match up icons to gain what people are just calling 'mana' - which are actually Boogers (Green), Poop (Brown), Piss (Yellow), Bones (White), and Hearts (Red) and you use abilities/'spells' depending on how much mana you can accumulate.
I just like these styles of games, I have logged some serious time in Binding of Isaac, it's just a great game to load up, play a lap or two then go back to whatever I was doing.
Also, for anyone that might care it's coming out on Switch and iOS later.