So basically it's a game where you create your own tracks, it was originally a flash game but it's been changed to entirely HTML 5 , this version is slot faster,smoother than the flash version and it will be awesome if the creator became portable :).
Being a web page, it is portable. Just browse to it from whatever computer you are on.
But what if I want to play it offline?
Who Dares,Wins - S.A.S
Generally speaking, a web page is not an app, it can't really be portabilized under the PA.com system because:
a) Web pages are a legal grey area. While the source can potentially be considered open by definition of the way browsers work, the page itself often has no licensing information which means requiring permission from the creator of the page. Most web page owners are not going to give you permission because they want you visiting their site, not carrying it around on a thumb drive and never visiting them.
b) Most web pages store data on your computer that you cannot always guarantee will have the same filename, and therefore cannot guarantee you are deleting the right file and not deleting the wrong file when doing a cleanup after running.
c) Web pages that use HTML5 like this page have even more ways of storing data locally on your computer that the the Portable Apps launcher (more than likely) has not been set up to handle.
d) It's a web page. If you can't access it off-line, do what everyone else does: connect to the internet, or do something else.