Obviously I can't speak for every complaint levied at him, but I would say the largest criticism is how he's effectively abandoned the project for years at this point. I can only find two instances that he ever gave any notices. The first is this post several months before 0.6 on his own site from 2019 [
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]. I do believe this was shared on Patreon as well so that seems reasonable. The second, an admin on his Discord communicating an indefinite break that lasted about a year [
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]. A post that never made it onto Patreon as far as I can tell, the only site that is guaranteed that 100% of his patrons have access to in order to receive an update that substantial.
Just looking at the update posts on his own Patreon paints a clear picture. After the X-Mas episode in Dec 2018, progress all but halted, with two entire updates in the timeframe of 2019 till now.
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Two updates in the span of about four and a half years as of now. Makes this statement from the archived link quite funny in retrospective,
"It’s now been more than FOUR full years that I’ve been developing adult games without taking a vacation."