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I've read through the thread and couldn't resist commenting.
Guys, why reinvent the wheel?
If you want to make it like the third game, wouldn't it be easier to just buy it? :)
Or, if you want to combine everything into one, you'll have to break the game's code, insert new things, and add new images, etc.
The problem is that you're not familiar with the code, and it will take a lot of time to figure it out. Adding new things will take even longer because the game consists of more than one file.
So, I think it's a utopia.
P.S. Maybe I'm exaggerating a bit, but if you really want to, why not? It's just that there are too many "must-haves," and implementing them isn't that simple.