It's a Surly - I'm surprised it didn't demolish your bikestand when it fell over, LOL.

Just ride it. Thats just a small-medium dent in my experience.

The stress the tubing "feels" is more along the top and the bottom surfaces of the top tube. The sides, not so much. You'll be fine for many years. If people ask or make silly comments that it is gonna break or fail suddenly, just tell them that you live for thrills and danger.