That sounds like great progress already. Do be prepared for ups and downs as this can take a lot of time, and to see change already is very postitive. So many behaviours can alter and find level ground that all are happier with once you get to know each other and ways of communicating.
I'm afraid Mouse is a very quiet cat so I am not able to give any advice from experience here. It could be that when he was a kitten his family were very vocal when playing and play hunting and that is why he makes the sounds, or it could be his way of communicating to you when he does or does not want you to join in. His posture and facial expressions will also give you clues as to which message he is giving you so as to avoid getting in to that cycle of him attacking again.
Looking forward to further updates from you on how things go.
I'm afraid Mouse is a very quiet cat so I am not able to give any advice from experience here. It could be that when he was a kitten his family were very vocal when playing and play hunting and that is why he makes the sounds, or it could be his way of communicating to you when he does or does not want you to join in. His posture and facial expressions will also give you clues as to which message he is giving you so as to avoid getting in to that cycle of him attacking again.
Looking forward to further updates from you on how things go.