What kind of things are you specifically looking for in your game music?
Music that loops well and adds to the game experience without distracting players
What are things that may make want to or not want to purchase the music?
If the music is distracting to the player, for example, if it suddenly gets louder or changes tempo drastically. If I want the music to change drastically, usually it would be a scripted event that I'd want control over.
What are some things a games composer could do in their music packs to enhance your experience when developing games?
Its nice to have similar motifs in the menu, peaceful, and boss music. It helps that game feel more cohesive.