To those who don't know, sadly this game is unable to be updated due to age, as any changes simply break the game. Think of it as similar to Half-Life Source, except this game wasn't buggy on launch. It's gotten buggy due to flash's changes.
To best experience it, follow the guide in the description to set up the Newgrounds Player, and you'll be golden.
The sequel also has a free demo on steam and kicks ass.