Vertigo

The Xenophis, a Vulcan exploratory vessel, has incidentally found the mythical sector of Firia where the planets, only reachable through warp tunnels, are told to be made of staggering ice and liquid fire. As a precautionary act, the Xenophis crew are attempting to launch interstellar probes, significantly altered to exist within the Firia atmosphere, in order to learn more of this magnificent piece of the galaxy. However, evidence shows that the former inhabitants do not like outsiders. You are the probe, and your mission is to maneuver your way to the other end of the warp tunnel. You are equipped with two shields, one to protect you from icy drones, and another from fiery ones. However, only one shield can be active at a time. WARNING: Be quick; your nerves will be tested.

Vertigo is a completely free and open-source project licensed under the GNU GPL. The game is written in C++, and built with Ogre3D, BulletPhysics, and OpenAL.