Making me choose between Zeno Clash 2, Gunpoint, The Swapper, Proteus, and Kentucky Route Zero?
You are an evil man!
I'll go for Zeno Clash 2. I love those other games, but I haven't been as feverish as I have whenever I recommend Zeno Clash 2. Ambitious sequel for an indie game. One of the most imaginative worlds ever in a game, some crazy twists that change everything you know about the world, and easily still the best first person melee combat.