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Cosy Creator hasn't replied yet, so I am taking the liberty of telling you what I know. 

The first release was about two years ago and included the first 10 days. Since then there have been 10 more releases and 16 new in-game days. I think that's pretty fast for a game of this quality.

Elsewhere, Cosy Creator has recently provided an outline of future game content. Sounds to me like material for another 2 years of updates at this rate at the very least, maybe even a lot more. Cosy Creator did not mention additional girls, and with the potential love interests we have encountered so far, it already looks like a potentially huge harem. On the other hand, there will be time skips to university, so some university students may be added. (At the very least Samantha, who already has a crush on the MC but is so far classified as a side character.)

I am not sure what you mean by limit. A limit on the harem size? Since the novel is essentially kinetic (i.e. linear), the harem has the same size in every play-through.

Hey, sorry I missed replying to this! I get a tonne of messages after a release, and somehow this one slipped through. Most of the questions have already been answered, though I would say there is probably around 4 years of content left to develop, going by my current plan. There is one more side love-interest yet to be introduced (a childhood friend of the MC), but other than that the main cast is set at this point.

And thanks for playing, I'm glad you liked it!