Retsuko looks really cute up there, it wouldn't be hard for kids to warm up to her pretty soon. The only downside may be that they don't really understand her character. Well, unless if she plays in a kids anime soon enough.
Relatable comedies definitely are the best, and from your review, I sure can see that this has all of that.
Most of the characters look interesting especially Gori and the manager, no doubt you enjoyed this. Great review!
As a character mascot, it'd be easy for kids to like her, but as a series, I guess you gotta experience a bit of life to laugh at it.