I am using the Firefox browser. I have found no problems or bugs in this short, sidescroller toolset. In fact, the only thing I noticed was the infinitesimally small drop in framerate when saving. There no drops anywhere else as you surmised. That is all I have to report.
OatmealPecheneg
First thing - when i went to the first level i missed 2 clones.
when i started new game second time i got only one clone.
Clones allow to use exits and saveponts.
When i load game with them they are dies away.
Hyptosis
The clones is a bug, lol, should be fixed now. Was hoping no one saw that! :D Thanks!