Anyone know a font that looks similar to this one: http://flat-it.com/sneaker.php

That I can get for free, obviously? I need it to look like that, where the script continues on and looks like a hose or gel writing on top of a cake.

Thanks in advance!

To create such a font is very time-consuming - and difficult! It takes lots of alternative letters and advanced OpenType programming. So I don't think you will find a free font with that quality...
Sneaker is not that expensive. Buy it, save yourself a lot of searching, enjoy!
(Beware: to get it to connect automatically you will need to use software that can use advanced OpenType features - like Adobe CS...)