5/5 awesome game.
I really like how more aliens spawn from each orb/egg depending on your score, at the end 15 aliens spawned from one and it got really scary when two of them spawned right next to my army.
The AI is a bit buggy but it became more of a blessing rather than an something irritating later on in the game. (the bugs mostly involve them standing idle, their path-finding works great!)
You can climb the hill to get to the guy you ask about the lorry, you don't need to finish the extra area to open the pipe to get a platform to jump on.