It's not the dated graphics. It's not the inexplicably long loading screens. It's not even the fact the hammy voice acting, or the fact that the game has a pretty steep price point considering what it has to offer. The main thing that stands out in Beast Quest is the lost potential of what it could have been: a rich, engaging RPG about a young knight finding his feet in a magical world. It wouldn't have reinvented the wheel, but it could have at least tried to give us something more to work with than the bare bones of a game from the 2000s.
There's nothing wrong with the aesthetic of the game or its reliance on tired clichés to tell a story. It's truly done a decent job, but that's the crux of the problem – it's just okay. It's a fun title to whittle away some time with, and you may even find yourself warming up to your party members' impenetrable plastic hearts. However, it lacks a compelling narrative, balance, and combat variety necessary to make it as engaging as it should be. Rainbow Skies feels like a blast from the past, before we had mainstream exposure to the tactical titles that it's clearly drawn inspiration from. Nostalgia's all well and good if you're pining for a better time, but it feels like a return to an era that we've intentionally left behind.
Unfortunately, it seems to be spread a little thin and it makes a huge sacrifice to the narrative that its cute enemies can't quite make up for. It's still a good roguelike by any measure of the imagination, and the developers clearly know what they're doing. However, the good stuff is a little too easily obscured by the frustration that can pile on after you've been whacking away for hours. If you have the patience and a relationship with Touhou Project, then this is undoubtedly a good buy. If this will be your first introduction to either roguelikes or the Touhou girls, you may want to start with smaller prey.