same, i also played serenity first, and gave it like maybe 6-7/10. and i'm not really much of a fan of 'tie in's (its kinda like breaking the 4th wall), but the way Last Human handles the cameo appearances without breaking the 4th wall is kinda unique (even kinda making yourself a cross-over character (in fact i LOLd when rin said "he even has the same name", cos like, yeah, i namechange to Ghryst in every game i possibly can), and it boosts the score of both games simply with the way its done.