A more concise pitch.
From that page it seems like your efforts went into everything except the game itself, and when I try to skim through I'm having hard time understanding what the game actually is. Video started with the same feeling, like it's trying to sell me the game without showing me the game. Something mmo something something tactics and history..? Gameplay section is way too long and disjointed, it's like watching a lets play episode 27 rather than a showcase of the game and it's features. You should NOT be having framerate issues with a game that looks like this, and even less you should be exclaiming it in the video.
If it's a /tg/-tier game then that's just not my thing, so maybe I just don't get it.
Tell your artist to get a new monitor or something, jesus christ. Everything looks like it went through some kind of a burn/dodge filter, and the composition is messed up. Take pic related for example, it's clearly about some dude delivering a scroll, but he's completely in the dark all of my attention is drawn to the blinding light behind the guard and whatever ceiling light is falling down.
This is more of a game-related feedback but spend more time on your ground textures. Spend a lot more time on them. The ground texture is one of the most important textures in this type of games, and it seems like you just slapped a noise filter on a flat green plane and called it a day. The texture you have on the floor can completely kill the aesthetic of your game, and it kind of does in your case. It's not helped by the lazy looking white grid overlaid on top of it.