May be the best beer you ever make (but I doubt it).
Over heating the grain a bit isn't a good thing (you didn't say how much, so I assume just a bit).
In my opinion, the bigger problem is pitching the yeast to warm. That can stress the yeast and cause off flavors.
The reality is, there is nothing you can do about it now. Just relax and let it do it's thing. This will be a good lesson... when it's finished, you'll know the impact of this combination of mistakes. Once you make ALL the mistakes and learn to prevent them you'll probably be the only guy here that doesn't make some kind of mistake on every batch.
BTW... Welcome to HBT.