Excellent strategy casting Liam Neeson. It guarantees that many people will see this movie for at least three independent reasons:
1. Liam Neeson is in it, so it must be good.
2. Liam Neeson is in it, so people who must see Liam Neeson movies will see it.
3. Liam Neeson is in it, so people will want to see if he is enough to redeem an otherwise ridiculous premise.
Liam Neeson aside:
I'm wondering how the girlfriend/daughter dynamic ties in to the "alien" encounter.
So the "aliens" just want to play the game for real? Like they shield off an area, jam radar, and shoot the crap out of each other? Or do the aliens not have their radar/equivalent active? What's the endgame? "Battle to determine fate of planet based on naval combat skills"? Why not just wipe out the battleships?
Are they "aliens" or is it lost ancient tech (or entire race) or something?
They were dead all along, weren't they?
Other than that:
Pretty CGI and guns and explosions!
I'll probably wait for Netflix streaming, if that.