Uh... hm. I was a little confused playing this, and also a little underwhelmed. The original language is not English, correct? The translation is a little bit clunky and makes it awkward to read, but beyond that there's a lot of unnecessary back and forth and extra detail that doesn't need to be there. What was the point of Mishi thinking he got lost in the forest for a second and then saying he was joking, there's a sign? Why have Tyraduin meet with Mishi prior to the ceremony if they don't really talk about anything that shows their character? All that backstory about the 3 previous rulers and Mishi's chess buddies... I get that one of them is related to Tyraduin but I couldn't tell if it was the second ruler or someone from the chess club, but other than that is any of that relevant or is it just world building? You could skip from Mishi on the hill reminiscing directly to the ceremony scene and lose very little, just introduce Tyraduin then. My experience with this was to read through about 5 minutes of worldbuilding and then immediately die as soon as I had a choice, and then there was no autosave. No offense, but I'm not going to play through it again.
The differences in art styles is very jarring. Old Mishi and the palace staff look like simplified MS Paint style, Tyraduin and... Bird Guy--long name, didn't catch it before I died--look like they're made from an anime character builder, but then their clothes look like they came from a different program. The portrait of the first president is a pencil sketch. What nation has a presidential portrait as a pencil sketch? It's bizarre. Old Mishi does have a very cool design, even as a simplified character. I do want to say that.
I was confused as to whether Old Mishi was actually a chess master or if he was just called that. Them learning chess from war with earth and adopting it into their leadership hierarchy is honestly pretty cool. Some of the other stuff was just weird, though. The elite earthling group that sealed Mishi's ally was called "Very Young Xtreme?" What? "Say no to assassins?" What, like it's an anti-drug campaign?
I feel like I'm being mean. I'm not trying to be. There's a kernal of a very interesting story here, it's just the execution feels a little off. I think what it is, is that there's 2 very different interesting stories in this that are directly at odds with each other. An old ruler playing chess with his would-be successor and ruminating on his life and the nature of war and power, revealing the flaws in both his and his successor's outlooks tied to their chess moves is a very cool contemplative story. An interplanetary or interdimensional war with over the top action, goofy anime tropes, and chess masters fighting extreme teens is also fun, and it's a little extra fun because we're seeing the story from essentially the bad guy's perspective. But the story can't be both. You can't have a tired old ruler reflecting on his mistakes and lamenting the loss of his friends, and then summon a magic sword to fight an interdimensional bird demon. The story can't survive that kind of tonal whiplash.
I don't know. I hope this isn't too harsh. I think you may need to strip this story down to the basics and figure out what it's supposed to be. Then again, maybe I just don't get it.