I am super stoked to find other 3D browser games to try out! Overall, very nice job! It's a really quirky idea, picking up Yaks, using their... um... yellow orbs as fuel for your ship. It's amusing that they just flop on the floor like a toy when you drop them. I played until what I think was the end? It *ONLY* took me 1336.156999..... seconds to do it! Cheeky computer.
I must agree with previous comments that the camera controls are inverted and kind of disorienting... I did as much as I could facing one direction and only rotated the camera when I couldn't interact with things without doing so. It kind of made me feel motion-sick to rotate the camera the way it was implemented. I was confused about putting fuel in the storage, given there were only 5 crates with one slot each... I ended the game with a LOT of yellow orbs rolling around the cargo bay.
For a 3D browser-playable game made in 7 days, you did pretty darn well!