I will share some things I discovered. First of all ENG version was/or still is completely bugged with save files (gallery doesnt unlock, continue doesnt work) - so much so that booting it up breaks my JAP version save file. I recommend to play on JAP versions and if you tried ENG - I recommend cleansing register and app data file before. Also dont be affraid of JAP version - the game has barely any text and many buttons are in English anyway.
Even in Jap version gallery is bugged - caterpillar doesn't work and rabit preg animation doesnt worked - there is nothing to be done beyond waiting for fix. Preg variants you can see by clicking a checkbox with jap text top middle screen.
For full save. This one WORKED for me with JAP version (original post from page 1 to give credit):
full save from doujin-savedata, only for the jp ver, extract with JPN encoding on non-JPN machines.
Only the .reg should be necessary, but you could do both.
EDIT: I played a little bit more - it seems that jap version will work with save but if you start a new game gallery is fucked again.
For general progress registry is enough for gallery also app data local low game300 data.json.
ALSO you can modify the register file and make the game open in bigger resolution - there are 3 width and 3 heights setting - I modified all of them to corresponding values for bigger resolution and it worked - just some UI is on wrong place.
Now for the game itself:
You can go with easy mode
edit: it makes enemies easier to kill, then when you end once there is "no damage" mode - in reality you get damage but then you stay on low hp.
For unlimited arrows on the start go left and shoot couple times as to break something (there is sound and it works even on first play) -> you can go behind wall find an altar that gives you unlimited arrows for the entire game.
To progress you need to go through doors - be aware there are many side rooms -> the correct doors always have something near it -> first stage there is a stack of stones, second are pink flowers, third is white flowers.
Now for endings and my experiments:
There are 3 ending and 1 bad end:
Slut ending -> she gets captured by monster,
Middle ending -> she wants more,
Pure ending -> She kills everything.
Now I did some tests - if you fuck around during the standard game -
not last boss fight -> I always got slut ending no matter what (high hp, low hp, fucked or not) -> I assume there is some kind of meter how did you play.
Now to get middle and pure ending -> I went not fucking ANYTHING - just couple graps but never allow to end animation -> then in boss fight:
for pure -> you need high HP
for middle -> low hp
To be fair I didnt test if here i can get "slut" ending but i also didnt allow to end any animation.
"Bad end" - if you loose to last boss and choose end - you will get him fucking her in preg variant in woods.
Pregnancy guide:
All enemies can get you pregnant minus last boss and huge tentancle monster (i think).
There is a hidden chance but in general three animation in a row always end up in pregnancy.
For slimes it is 100% chance as they inflate her.
Leeches and slimes produce "adult" versions that will attack her.
Slugs and catepillar both produce eggs (couple for slug, one big for catterpillar),
Rabbits and spider boss produce smaller versions that run away.
Dog and pigs produce smaller version that will follow you - albeit they are slow and can be lost, and cannot jump over holes.