The most unique and quirky game I've ever played, and likely ever made.
Made by a team in my home country (Go Chile!), Rock of Ages is an odd hybrid between a bowling racer and tower defense. The game is a sort of duel between you and an opponent (either human or AI-controlled) in which you each throw boulders down a track toward your doors. Between rolls, money you earned from rolling your boulder can be spent on tower-like constructions to slow down, weaken and hopefully destroy your opponents boulder.
The game features a huge amount of very fun maps, to the point of which it could've been a full game without the tower defense aspect. The humor is, as said by others, Monty Python-esque, with 2D paper-like animations for characters. The campaign takes you through much of history, with plenty of genuinely funny cutscenes!
This is honestly a game I cannot recommend highly enough. It's quirky, sure, but the humor alone is worth the $10. Good luck, and first downhill wins!