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Save 11 - about to talk to rei, if you want or not to be gf.
Save 12 - kento fuking rei (if rei is gf, eva will be on her place)
Game in general needs to follow either
NTR knight or
BREAST MAFIA - NAMPA BEACH mechanics as it seems to be reaching for that, but having poor user experience and frustrating choices by making the player explore for each day cycle for content in a continuous manner.
Hints are fine, but sometimes they are wrong, like when it says 'friday for rei and kento night', but there is no content.
As a QOL, I would add a map with icons of the characters and fast travel.
For animations, I am not familiar with your workflow, but
Cascadeur can help with the animation workflow.
And as a petition, if pregnancy could be a mechanic, I would love that.
Did like the game as it had some aspects of NTR Knight and i love sandbox.
Map size is not the problem. maybe a way to increase player movement speed.