A good employer has little to hide and won't have any problems with you chatting up other workers during the interview visit. Do your homework about the company - startups pop up every day and die every day. Ask them about their experiences working with the company and try to get a feel for what it is like before you move. Ask about credit on the project. One final thought - try to stick around to ship at least one game if you're unhappy.
Nothing looks worse on a resume than to see a person who hops from company to company every year.
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