This game looks a lot like Eye Attack 2, but 3D (or just SMG with an eye).
GMC topic: http://gmc.yoyogames.com/index.php?showtopic=571949
Player controls:
W - Forward
S - Backward
Space - Jump
Camera controls:
Scroll - Zoom in/out
Move mouse - Look around (and move camera if you don't right-click)
Left-click - Forward
Right-click - Stop camera from moving
F5 - Toggle first person view (yeah, I know, it doesn't rotate upside down when you're at the bottom of the planet, maybe you could help me achieving that)
F - Change the view distance. Normally this is 1024, you can make it up to 4096.