He knows how to play, you may just need to encourage him differently. Try different toys, such as hanging toys, cat jingly balls, baby toys, or homemade toys.
Bunnies chatter their teeth sometimes when they are content. If it is quiet and doesn’t sound like he is in pain, I wouldn’t worry.
He may just not be comfortable. You can try to coax him out with treats, but if you are quiet he will come out when he’s ready.
You can feed him lots of things! Here is a HRS list of good foods:http://rabbit.org/suggested-vegetables-and-fruits-for-a-rabbit-diet/
You can try “bunny burritoing” him or you can put him between your knees with his head facing outwards, bend over him, and pick up a foot.

He probably just want to play in his own way if he wants to play at all. When you say this, exactly what do you mean? He doesn’t like to play with toys? Many rabbits don’t.

Well, he sounds like he just likes to play when he wants too – I wouldn’t worry, he sounds perfectly normal to me.

Many times buns are active early morning and evening. Bumpy adjusts to our schedule, thankfully. He’s active usually between 8pm and 2am and kinda piddles around any other time. No matter when I get up and come into the room with his pen, it’s time for him to be awake in his eyes. Bumpy doesn’t “play” very often now either, he’s about 1 yr old now. But we still catch him binky or bunny 500 every now and then. He’ll play with his stacky cups maybe once a week. Maybe roll a ball for a couple seconds.

Other than that, I’d say his favorite game is “make the bunny slave give me treats”.