Vcsu!

Hi guys, New to the site but, a longtime vcs fanatic. I also play OSU! on my spare time as i love elite beat agents. I was wondering how difficult it would be to create a simple port of Osu!. Here is a small video of it in action. I have been reading andrews assembly language tutorials and know some assembly language. I also own a an Atari 2600 and Harmonary cart. From read the technical specs, it looks like i will have to simplify it quite a bit. Can someone please tell me the feasibility of this? Any assistance in this matter would be greatly appreciated. Sincerely, Vcsu!