You damn wankers need to give some credit where it is due at least. Not easy to make a full on ero game not in VN or RPGM format and for fucks sake
any comments about graphics are incredibly stupid. 30fps is fine and it ain't no huge studio with millions in cash to waste an absurd amount of time on graphics
Some people's eyes genuinely hurt when they play 30FPS games, the choppy movement with the camera's floaty nature can cause motion sickness too. Unless you're a console player and/or still own a Switch 60fps is the standard even for platformers and small indie games far bigger than this. That's just industry standard now. In 2D games it doesn't make as much of a difference, although everyone can appreciate really nice and smooth animations, but in a 3D space it can do some shit to your eyes.
Unreal 4 has pretty good tools to make models not as jaggy, and this game comes with no graphics settings to fiddle with for people with weaker/stronger PCs, or to help with the motion issue. The game is purposely locked to 30FPS, it can probably run at 60 if allowed to. This game also doesn't have mappable controls which is a must for any PC release if you want to make it playable with a keyboard and peoples varying setups.
You're vastly underestimating what a single person with enough time can make, but beyond that it's missing very simple QoL stuff that comes prepackaged with Unreal, meaning it was a conscious decision for them to make it like this. It also wasn't made by a single person and self-published. A company that has published over 30 games since 2020 put it up on Steam after being out since December in Japanese storefronts.
Credit where credit's due, but that doesn't exempt anyone from criticism about the parts that are lacking. The game came out last year, giving them a lot of time to polish and patch things as the feedback from the Japanese players came in as well. Being this defensive about it undermines whatever work they put into the game, as if they couldn't take criticism.
Lastly, this is hardly a "full on" ero game. There's lewd scenes in it, but it's got a lot more focus on the gameplay. From what I've seen aside from a few unlockable scenes most of it is defeat-rape and there aren't that many enemy types but I can't say that 100% since I'd need to finish it and I'm working on that.