David is an addicting physics-based short boss-fighter with super minimalist graphics.  You control a little square named David, who uses yo-yo like physics to shoot and retract rainbow projectiles in fights against geometric enemies. The action of charging your projectiles also slows down time, making it an essential defensive move for avoiding enemy attacks or navigating difficult passages. it takes about 2 hours to clear all levels, with additional replayability added through the included arena mode, although the included best time/score leaderboards don't work unless you get the game through Steam. Each stage requires slightly different strategies and can be completed on two difficulty levels.  Controls took a little while to get used to and I died repeatedly, but after I got the hang of it I found myself infinite-jumping through the sky slinging my rainbows around with ease.