My thought, just on the first page, is that there's too much extra, too much "the thing is", "anyway", cursing, asides. It really breaks up the flow. You can get the same character across with maybe a quarter of that stuff. This much volume makes Mark really unsympathetic, for me at least. It also reduces how much content you get across. There's nearly a thousand words here, and most of it isn't dialogue, but I don't get a lot of genuine emotion or detail about the setting.