I would say different, if only because I am not familiar with the source code for the original. I know the fruit appearances are based on how many pills you collect, whereas mine are a fixed time. My cat behaviours are a bit different. I have a whole bunch of different maps. I imagine there are other differences.
Raw javascript (probably one of the reasons it loads so quickly). I use a custom-built binary resource file that holds all my graphics, map, text and music data. That file is built using a custom-made game resource editor (Trying to add 00s and FFs to a file manually is a bit... well, no way I could do that).