Sounds like your doing ok just play with him but remember to keep some ground rules as long as u don't jump him or get on just keep taking him out putting rugs on etc he'll make a really nice horse and backing will be easy.
I spend hours with all our young stock often found in the field playing or cuddled up with them all asleep its the best time ever enjoy

Hi, what breeding is he and what are you going to do with him? Are you going to geld him or leave him entire. I agree with everything thats been said especially the point about voice commands paying off. My section a's are so easy to break in after all the ground work they get when they are young. I always walk them past 'scary' things like black bags, umbrellas, drains etc. As they are kids ponies I try and expose them to everything I can. I dont back them until they are 3 then turn them away until the following year.