Haxeflixel 3d [patched]
A masterclass in 2.5D visual depth. While not "3D", the game uses complex parallax, scaling tunnels, and rotating perspective rooms that trick the brain into seeing a 3D space. All of it is pure Flixel 2D transforms.
It isn't true 3D. Instead, it offsets sprites based on a camera angle and scales the game window down to simulate depth. The Verdict: haxeflixel 3d