The latest entry to the Million Dollar TTRPG Kickstarter Club is Adventure Time: The Roleplaying Game from Cryptozoic Entertainment. This is the third million dollar TTRPG Kickstarter in the last month or so (and the 4th so far this year).
Adventure Time is powered by D&D 5E and is based on the popular animated show--which itself was inspired by D&D. You play as a resident of the Land of Ooo with characters like wild berry barbarians, vampire rogues, and penguin warlocks.
The game was originally pitched using a custom system (the Yes/And System), before pivoting to D&D 5E; the custom system version is apparently still coming later.
The Kickstarter ends tomorrow. At the time of writing it had raised $1.25M from nearly 6,000 backers.