Your brew is not ruined. But it may end up being a bit sweet. The higher the mash temp, the less fermentable the sugars are. It is a very good idea to read the link provided in post #2 above to gain a full understanding of what takes place during mashing and sparging.
"I brew with a water cooler and some part from the toilet." - JohnnyO
"I do gravity feed the last gallon or two through my Therminator, but I expect you could suck start a Volkswagen before you could suck start one of these. - GilaMinumBeer
"..... Bull was right." - TXCurtis