£400? That's a reasonable amount. I could do a fair bit with that, it would help me out no end at the moment with rent and everything. But at the same time, I'm a moral sort of person and wouldn't like to take a bribe.
So, I'd take the money. Then I'd give them the exact same review as I would have done anyway, whether the game is good or bad, I'll give it an honest review. And keep the money. The developer can hardly complain because if they do, I'll be able to tell people they offered me a bribe and they'll lose much more face and credit than me. And I won't be compromising my journalistic integrity, and come out £400 up. So I win regardless.
Serves them right for having such low expectations and confidence in their own game.