I did a basic collision system. It uses both bounding sphere and bounding box and you can select one or another as your wish. I've also fixed some of my Math3D unit functions (for example, it didn't normalized vectors correctly and it did draw stars instead of spheres) and now the octree is updated when you move objects.
As you see I've also changed the camera motion.

Now the game engine is almost complete. If I can add an height-map scenery object and the mission loader then I'll be "on time".

Right now I don't know how I'll do the HUD, and game needs some kind of radar system because it's hard to find the objectives.