I had difficulty locating one myself so when I finally beat the game and unlocked everything with the cat, I decided to upload my save. It'll have all CG unlocked because I talked to the cat, I use a lot of saves, so I kept 3 so it doesn't overwhelm. save3 is before final boss fight, save4 is right after final boss fight before free exploration, and save5 is for newgame+ (in save5 due to accidentally overwriting, it is the only save with over 122 slut level to equip the moo suit and where I got its skill as well). As far as I'm aware, I got all items and all skills. The saves apparently revolve around Ending 5 so if you want another ending to explore, need to do it yourself, but at least will unlock everything. I also did the easy mode, not the hard more to see and explore everything. Ended at level 51 I think.
If for some reason, CG isn't fully unlocked, just talk to the cat at the very top of the castle. Without cat, the base game stuff should be unlocked except for dark meltys (didn't do a new game + so no way I could have beaten her) and any extra stuff like the minotaur brothers except for defeat which I did get before the cat.
I played the Windows version 1.2r in cases of compatibility issues. I also used no cheats at all, so unless bugs were saved, should not have issues due to configuring anything.
Note: I have tested it, you are strong enough to see dark meltys's ending on easy using the new game +, unfortunately, on hard mode, I couldn't beat her on the new game +. I'm guessing just too low level which I thought I was pretty high unless there's a better strategy I missed with what I had which should have been everything in base game unless I missed something.