I feel like this would be more interesting if the mom was just a regular top-tier adventurer that retired to dote on her son instead of a broken AF immortal dragon. Choosing the latter over the former means A.) no tension because you know OP mom will solve any problem that arises and B.) it comes off as extremely creepy, she's basically a demigod that kidnapped a human child to keep as her pet. There's nothing endearing about the way she acts, its more a disturbing sort of feeling like I'm watching a borderline pedophile/child abuser(which is admittedly super fucking common in manga, though the genders are usually reversed).
If they did it as more of a psychological horror about a kid trying to escape the grasps of his overbearing insane immortal mother that might be cool, but as a comedy it just falls flat since its not that funny watching a kid be mentally abused by an ancient creature masquerading as a mother figure.