I finally found the bug that caused Tracy to shoot the wrong way the first time after changing direction : it was, of course, the use of the wrong variable. That’s what you’ve got when you do not sleep on a bug !

Well, it’s uploaded now and I also modified a little the level design so you can’t jump into the fire if you’re not careful. If you use the web version, empty your cache before reaching the link ! (the MacOS version is now a zip file as the windows version).