On the 4th of August I uploaded my game to Kongregate. Since that time it's had 457 plays on that site.
On the 11th of August I uploaded the same game to Newgrounds. Since that time it's had 40,000 plays.
It's funny to think about it now, but I actually uploaded it to Newgrounds as an afterthought. Why? Because of Construct 2's seamless integration of Kongregate's API, and the carrot of leaderboard functionality dangling before me.
Well, after receiving only 300-something plays I was a bit let down and thought my game deserved more exposure (as, I'm sure, every game developer feels with every game they make). So I casually uploaded it to Newgrounds, thinking there was nothing to lose at this point.
The game was promoted to the front page, from which position it was able to rise to become the most played game of the week. Whereas I've had a handful of comments on Kongregate, on Newgrounds I've accrued 22 pages of feedback. Only a minority of it is constructive, but that minority drowns the feedback from Kongregate into nothingness.
I'm making this thread to champion Newgrounds as a fruitful avenue for getting exposure and feedback for your game. Kongregate seems to have the ascendency around here, with its official support within Construct 2, and the stickied thread for Kongregate games you can see in this subforum. But ignoring Newgrounds could be a big mistake.
More HTML5 games uploaded to Newgrounds might have the knock-on effect of them introducing that much desired API for HTML5 games too.
Ascent Newgrounds
Ascent Kongregate