Not bad... but not good either.
Okay, the author put a TON of work into it and you can tell. It's just that it's not interesting. First of all, there's no reason for the robot to think in terms of "prehistoric" and "modern." I assume the glowing green thingy is of alien origin. If anything it should think it's on the wrong planet, and should think like an alien. (Also, I assume the robot is just a mannequin made out of sticks and stones, mysteriously animated by whatever the green thing is. So wouldn't that make it more of a golem?) I know I'm overthinking this but there's just so much "yeah right" to this story that I couldn't get interested. Anyway the robot should be able to just walk across the bottom of the lake. It's not like it needs to breathe or anything. And how can the caveman lift such a heavy stone contraption using a primitive fishing line? Even if he's really strong for a human the line would snap. And why 3 megs of download for a 2 minute film with 3 lines of dialogue? And how come th... *HEAD EXPLODES*