I remember something similar happening to another person, that Grimrock was accidentally running on their on-board graphics or something, even though they had a better one, or maybe it was the laptop automatically scaled down the graphics due to not detecting the game right, or something like that, very similar issue as I recall
well I would think so, but I just can't quite remember the details of what the problem was, like it just automatically filtered down the textures or something, bah I can't remember