If Team Fortress 2 taught me anything, it's that hats are great. Austrian indie devs Salt Castle Studio reckon they're great enough to warrant their own game altogether, so they've created Chapeau, a multiplayer platformer in which you control various pieces of headwear, from helmets to top hats. An alpha version is launching "soon".
https://www.pcgamer.com/chapeau-is-a-multiplayer-platformer-about-being-a-hat/