Im sorry if this was answered before but... do i miss a lot of content if i don't go for one or two of the main girls? Or i just miss their scenes or maybe i miss a important part of the main plot aside from the scenes? I will like to know this before i start the game...
Also i didn't played OiALT should i play it before this one?
The game is generally designed as a harem game in which the player follows all the girls. You can drop their paths (either deliberately or accidentally), but it seems especially the new patch doesn't do a good job accommodating all the possible combinations and outcomes and sometimes events are referenced that might not have happened.
Oh and about OiaLT: No, while both games play in the same universe they are...I think...decades apart and so far outside of small (and not story relevant) references in Eternum there is no real connection between the games.
by miracle my save files are still on my PC somehow even after deleting the folder... lol how is this possible?
Which folder? The game folder? Renpy saves all save games twice, once in the game folder under "game folder\game\saves" and once under C:\Users\"Windows User"\AppData\Roaming\RenPy\"Name of the game". So you can generally, if everything works right, delete old versions of a game without losing your saves.