I am currently working on a short film with a similar client. With the addition that the client I have wants to control/dictate how I compose the music. So I know your pain!
Deadlines are a powerful tool. You know best how much time it takes to compose a complete cue/track. You need the client to make decisions so that you can deliver. If a deadline is coming it is okay to remind the client of it since you are both in the same boat.
Did the client have any temp tracks or placeholder music? To save yourself from working for nothing, have the client give your reference music. It sheds light to the mind of the producer/director. Has the client expressed genres he likes or associates with the game? Any artists?
If you start to get frustrated or confused, just confront the client about the indecisiveness (I guess that is the word..?). "Sit down" with the client and talk through piece by piece what is his vision and especially how he wants the player feel. Game music is about arousing emotions and telling a story in the end.
I never begin composing unless I have more or less clear understanding of what the client is thinking. !!NOTE!! Culture and language can be a major major MAJOR hinder in artistic communication.
What ever the case, ceep calm and stay professional! There isn't really a silver bullet there. I guess it was one of the bigger Hollywood composers that once expressed that being a composer is sometimes being like psychologist. You must interpret often vague and/or contradicting descriptions of directors and somehow make sense of what they are trying to tell you whether they are actually saying it or not.