As someone who’s never touched assembly, I’d love this sort of thing as a tutorial; It was a lot of fun to learn about. The simplistic graphics worked well for the game. I would’ve liked a little more polish, like having the start menu show up above the current application, because it’s how most people normally interact with a menu like that. I would also have appreciated making it a little easier to find the relevant information the assembly commands, maybe in a user manual rather than a browser type setting.
Also good work for making minesweeper run on there too, the attention to detail you put into this OS system was really cool to see (even things like current system time too). Good work :).