My mail just turned 12 weeks, he was/is the exact same. I have got him (mostly) over the feet biting. He does get aggressive and it seems to be more when he is playing with his toys. All of a sudden he leaves his toy or chewy and comes at me instead. This only happens when I’m sitting down so I get up, tell him NO and try to distract him somehow. He gets plenty of exercise and is a great pup other than the aggression that comes out. He starts training this week so I’m hoping to get some feedback as to how to handle this. So basically I have no advice but I feel your pain lol.