Adding weight to what others have already said, it needs to be at the most 2 minutes long and the text at the top gets lost in the very bright and colourful game footage. You don't have to go into everything, but here is the "flow" I recommend for the trailer...
1. Introduce your robot...
2. ...then the game world...
3. ...and what he can do in it!
That said, I rather like what you have done with the game. Simple, but effective.