You've got some animation skill going for you. If it takes as long as you say it will, it'll no doubt be better when it comes out. Good luck on the project.
On the flip-side, I could see portal being used in madness, but animating madness as a parody is one thing, but putting a parody IN a parody is a little bit tiring. It's not that it isn't an interesting idea, it's just way too unoriginal.
Just be sure to credit Valve as well as krinkels, as the idea was just as much theirs as it was yours.