I'm glad you find the game positive, even if it lacks an ending. On the other hand, the arcade games of the 80s were conceived in this way. The goal was not to be able to finish them but to score as many points as possible hoping to enter the top ten.
As far as I'm concerned, if a game doesn't have an ending, I'm setting myself the goals. For example, in the case of Bagman Comes Back, the goal would be to complete 16 levels on the Hard difficulty level, after which I am satisfied and can move on to something else.
However, I will eventually take into account your observation for the next version of Bagman that... But I don't want to add more!