Seems your cat hasn't physically adjusted to its new life indoor. It is getting a little bored. He is missing its hunting and chasing in the past. You might have to play more with it and help him to be an indoor cat totally :).
en, my Q has the same problem. He doesn't play toys either. What I usually do is trying to keep him awake in day time, like drawing his attention shaking feather or thread, just reduce his sleeping time. Sometimes, I move my toes under the bed sheet when I am reading lying on the bed,Q is high to watch and hunt as my toes moving. Well, you might need more protection for your toes and leg if you want to play this game. Cats are different. You will find a way works better for your cat. Best wishes