Sadly that's the risk with games that like this where the Dev (seemingly) dumps out the game to just get some money in and rather than fix up the game they put all the money into the next game to get another pay out because they either need it or they want it. It's part of the reason why piracy is good since you find out how broken the game is before you hand over your cash for it and feel like you got robbed.
I have no plans to purchase this game even if they update it with new content if it fixes none of the old and add in quality of life improvements.
If restarting from scratch is not okay with you then you can try the few saves/gallery files that I believe are in this topic though the gallery honestly is horrible too in my view although it does show that the Dev may have actually had intentions for a bigger game.
PS
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which claims there's an update released which DLsite hasn't got yet from March v1.0065.