Here's a full save for anyone that wants it.Edit: Save got b0rked, deleted and edited the post, not that anyone's missing out on much.
The only things that you can miss out on are battle-rapes and maybe post-game scenes if you're not patient enough to get them all. Besides that, the game is absolutely horribly linear.
In many ways, this game is another one of those 'galleries with extra steps'. The combat doesn't really matter. The party is for the most part already OP, especially Latia, and on top of that, for the enemies with H-Attacks, stats don't matter at all except for Agility, which determines whether your team rapes them or they rape your team. Even then, one of the companions has a skill that can temporarily make a girl immune to H-attacks and doubles their AGI.
Eh.
They could have made a VN or something out of this and nothing would have been lost. Well, except for the fact that it'd have been even shorter because the story's barely there... Overall, this somehow feels like a downgrade to the Annelise game...