I still run Arturia Storm 3 and love it. They and I even traded emails on how I figured out how to run it on WIndows 7 using the Windows 2000 compatibility settings. Mostly I'm using Fruity Loops these days. Not French, but Belgian (almost as good?
Update: I was just looking at this thread and went to the French site. They now seem to be more active and the cost is only $27.90, so I bought it and I'll see if I can create something in HTML5 and put it into Firefox OS. You can follow them on Twitter @webcreative5.
I haven't tried lately, but I think also the problem was that Construct 2 doesn't didn't do tiles well. Now there is some kind of tile map feature that I need to investigate and I'm also looking at AutoTileGen which has a plugin for Construct 2.
And I'm still looking at an option I tried a year or two ago of creating the rooms in GameMaker and then importing them to Construct 2. But Construct looks like it has better tile-based RPG features now, so more to investigate. So many things are happening. This is about to be the golden age of HTML5 game programming!