I think this game has a lot of potential. The plot is interesting and the characters are well-developed.
I consider Sahi to be the only acceptable choice as RO or marriage option (unless the game permits a different RO than the person the MC marries). I like him and would choose only him but I cannot yet manage to actually get on his path.
I cannot decide whether I dislike Aalam or Lune more.
No RO should threaten war to force a marriage (however historically plausible that may be) so that rules out Aalam as RO.
Lune repeatedly insults the MC (main character) and makes clear he feels he should be in charge instead of the MC. He is somehow heir to the throne which should also make him a suspect in the MC's father's assassination. The only plus side out of accidentally getting stuck on a route to marry Aalam was naming Sahi as heir instead. Considering the MC rules by right of Celestial blood (effectively Divine Right of Kings), my MC would NEVER tolerate an advisor like Lune.
I would dislike Lune even more except that it appears the MC is every bit as incompetent as Lune claims. The one thing the MC was actually supposed to be good at, using a blade, resulted in the MC managing to drop the MC's dagger when faced by an assassin. There is not even a choice of whether to get drunk and humiliate oneself at the ball.
The two biggest decisions in the game are who to romance and choosing foreign policy (war with Andromeda, renegotiate trade deal under duress and risk war with the South, or give in to threats and marry Aalam). Those decisions apparently get made for the MC rather than actually letting the MC choose. The fact that a walkthrough is even necessary demonstrates that the choices are counter-intuitive. The MC has no choice of dance partner which would be the logical place to let the MC pick which RO to pursue. When speaking with the maid, leaning towards war is listed as the aggressive option yet raising aggressive appears to make the MC give into the forced marriage with Aalam which makes no sense.
My personal take on the personality traits is that it makes perfect sense that the responses of the potential ROs and other characters should depend at least in part on the MC's personality. However the MC's personality should not be used to block the MC's choice of actions.