Do not beat yourself up too bad....your friends and family will do that enough...hahaha

Good you learned some things in the process that is what life is about.
As for the temps, if 235 is all you saw the boat should be fine. Did you antifreeze tank overflow? If you have to add antifreeze there is a certain way to do it so it doesn't airlock and overheat. I can help you with that also, so just ask.

Have a good weekend