Is this going to be the normal writing style? Its kind of annoying reading every little thought he has at any moment. Also having the narrator is kind of pointless, doesn't/hasn't really said anything yet that rat couldn't have seen/heard.
Hm.... Somehow I can't help asking myself how the heck a small 12 cm rat managed to find and hunt 8 rabbits in a day. It feels like there are rabbits everywhere, and they just wait when something will fall from trees on them without moving at all. :/
Dude you've done a great job by pointing out the real life problems such as unknown factors, slow improvement and etc. But I think your grammar sucks, well, forgivable. But still, be careful.
Just throwing my two cents in here, I really like the stream-of-consciousness first-person perspective and look forward to reading the rest. Make sure you're keeping track of your math though, it looks like he gained 1 hp here, not 10 as you thought in your comments.
Innovation