I did a little investigation of what happened to get such amount of support in short time, because I was curious too.
- First, Oppai-Man has done games since 2018. It seems that he built a community through the years, in
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and discord.
- Oppai-Man announced in his discord that he was working in this game in july of 2020. 9 months before his first release. And kept his community engaged through polls about the looks of the characters, etc.
- In his first release Oppai-Man made a promotion to engage the most patrons he could: "
LAUNCH PROMOTION: If you Join before April 22, you can suggest a custom render of any girl, in any pose, doing anything you want.. Sign in to your Patreon account and join the $5 tier to download the game."
- In less than one month Oppai-Man got 100 patrons. 200 patrons in two months.
- And then the key moment happened: the youtube channel MxR Plays released a
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playing the game that has almost 900,000 views. But not only that, they shared an uncensored version of the video in their patreon of more than 14,000 patrons. The devs by his own means got 200 patrons in two months. But with the help of that channel and its patreon, they got 150 patrons and 700 sales in 1 day, 300 patrons in a weekend and they reached 837 patrons in that month.
- With the second release the devs got another big boost reaching 1600 patrons that month. It seems that after the video his community increased a lot and many of them became patrons in the second release.
I found something interesting about the development, look how the initial characters changed:
The initial Sue and Alyssa were:
Only 5% of his community liked the first Sue, so they changed for the actual one. All this info you can get it from Oppai-Man discord.