This is wonderfully minimalist, but definitely has the "Just one more game" factor, that any arcade shooter should.

I love how the planes move, my planes feel just enough under my control that I'm never left blaming the game when things go south.

Having the capability of offering mercy to my downed enemies certainly gives the act of letting them just fall, or get caught in the crossfire a lot more emotional weight than you'd expect from a game like this. It's a genius mechanic tactically, but it builds on the fact that the airplanes aren't entirely under your control, and you really feel the responsibility of command.