I don't want to be too critical to an early release like this, but there definitely needs to be a bit more material in the writing. Right now it's basically just the characters saying what they're doing and that they're happy about X/Y, and there's almost no pacing at all.
IMO the biggest offender was the lewd scenes. I'm sorry but a CG alone is not able to carry those. It needs a bare minimum of prose and dialogue. The romance/sex itself also had no real lead in. Lina and the player really needed some more interactions before I could believe anyway.
It's also strange that the dialogue head sprite reactions appears early on and then disappears suddenly. Was there a reason you chose to do that?