Good question. It can be any genre really. Just like corporate music… Sounding can be retro or modern or a hybrid mix, there is a lot of creative playroom in game music. It can also just be simple rock tracks or “epic” tracks that loops seamlessly. Main point in smaller casual games is that the music should be able to loop without being to repetitive and ear fatiguing.
I really think AJ could attract a lot of customers who are looking for simple music loops to their mobile games. Medium and big game projects will hire a freelance composer.