Parachute 22 is a simple paratrooper shooter based on the Parachute game originally included in the iPod Nano 3rd generation.  It's a really fun time with the Playdate crank.  If you don't have a Playdate yet it works great on the Playdate Simulator included with the PlayDate SDK too (two finger trackpad scroll == crank). Source code available too if you wanna peek behind the curtain.