My initial goal was to release monthly, before I realized I couldn't pull it off with my hardware. The "sane" and healthy schedule would be 2 months between updates, but I don't like having people paying me monthly and not giving them new content.
Can't you switch the payment model to "per release"? But then again, that would be a two edged sword, knowing that you can take extra time with no immediate consequences. Then the consequences only come later when people unsub if they think you aren't being active enough.
Personally, I wouldn't mind waiting a bit longer for releases of the size you produce them.
That's how Itch.io works, but Patreon and Subscribestar are monthly payment services, unless Hanako actively pauses payments in months no update was put out.