Great game, lots of fun. It gets a bit difficult to play once you start getting up to the really high levels, though. I'm losing patience holding space to dump 8660 souls into the field, and 5 FPS really is a bit low (before anyone says anything, I have a quad-core and 8 gig of RAM with 15% CPU usage while the game is running at 5 FPS and I'm only using a gig and a half of RAM at a time).
While I can appreciate the work that went into embedding these physics into an interactive flash animation, this is by no means a "game" and really shouldn't be on Kongregate.