Amazon’s fledgling game development studio released its first mobile game this morning, Air Patriots, a tower-defense game with a military aviation theme.

It’s available for Kindle Fire, Android, iPhone and iPad.

The simultaneous cross-platform release gives Air Patriots a widespread presence out of the gate — or the hangar, more specifically. On Amazon’s Kindle Fire devices, gamers will be able to use Amazon GameCircle to track achievements and scores, and synchronize progress across different Kindle Fire devices using Amazon’s Whispersync technology.

I’ve been playing the game this morning, and Amazon’s implementation of the classic tower-defense mechanics reminded me immediately of PopCap’s Plants vs. Zombies with a different setting and plot. Gamers fly aircraft around the on-screen map and target attacking tanks, trying to allocate their firepower and planes strategically to keep the tanks from advancing.

The game is free to play, but it comes with an aggressive in-app purchasing mode. Extra features and levels go for anywhere from $1 to $20.

Amazon Game Studios, based in Seattle, released its first game, Living Classics, on Facebook in August.

Here’s the trailer for Air Patriots …

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