I suppose it depends Marrend, if you feel like this is more of a chore than a exercise in working towards a goal perhaps a break is needed. Not a throw in the towel moment, just well, a Hiatus. That's why the status is available on RMN after all and why you've moved this game into that category.
Walk away from it all for a little while, both the new iteration and the fix-it-up version, If you don't feel it is right leaving a version up that has a bug, take it down for a while. The only person who can dictate how you spend you hobby/leisure time is you.
I have been known to needle developers if I really like their games to continue with a story, or a sequel (Enelysion and Yuna being the latest) but if she had turned around and told me to politely sod off and that her passion had waned, that is not only perfectly acceptable, it is completely reasonable and I would have accepted it with as much grace as I could muster.
It's your work and whilst I applaud the sense of honour you show in feeling a level of obligation to your betas, in truth it is only yourself that can claim obligation. If you feel it is the right thing to do to continue, then do so, if not now, then later. However if you cannot muster up passion then accept the fact it met the criteria for which it was developed and walk away.
Creativity needs juice, and if you have none for a project you will, in the end, be unsatisfied by the result.
I should say however that I have never played this game so I am, obviously, speaking only in the hypothetical.