Weird War II is a fairly popular setting. Taking all that happened in WWII and adding in the supernatural adds even deeper twists and turns to the events of the conflict. Other games deal with what's happening down on the ground. Dark Skies 1942 takes you into the... well... dark skies over the battlefields. The game is up on Kickstarter now.
Dark Skies 1942 is more than just a 2D fighting game. With climbs, dives, banks, and spirals, the game really goes 3D with the dogfighting and other aerial combat. More than just fighters and bombers have taken to the skies as well. Aircraft Carriers are now Air-Craft Carriers, letting you transport your fighter planes just where they need to get to the most.
The campaign is about 1/4 funded and still has 26 days left to go.