I'm curious: are the games in the arcade section of this webpage HTML5 then?
Glerikud: hurts me to say it because i really enjoy stencyl, but i got some lag and low FPSs even with really basic stuff. It may well be the case that it was due to my lack of programming knowledge, but then as stencyl is made for beginners, I would have expected it to be a little simpler or that those things would be taken care of. It may well be the case that construct 2 has the same problems.
I'm going to take this opportunity to share my game (work in progress). I'll probably finish it in stencyl, it would be too much work to start again with construct 2 now. Link: stencyl.com/game/play/34059