ngl i personally think that a good game page is a page where you don't even need to read too much to understand the game, and decide if you want to play it or not.
I don't play too much lore-based games, because of that, the format i like the most is: the short description already have a hook good enough to give a sense of the game, there is a webgl demo so i don't need to download anything i don't know if i will play again, there is a video showcasing some gameplay element that maybe i couldn't unlock or do, and a small, compact description of the game (AND CONTROLS).
Not trying to self promo, but as this format works for me, i use it to my game pages. I also make games with pretty minimal visuals, and i put screenshots in my game pages, so because of that, i also try making the game page have the same color pallete as the game itself, to make it cooler