Just your run-of-the-mill Incredibox template, with some small tweaks by yours truly. Look inside for instructions, blah blah blah, you get the gist. Also, I recommend editing in Turbowarp. It's not really better aside from less lag, but it's got a better editor, more tools and such.
Incredibox by So Far So Good, as far as I know all the assets are credited, and og Template by Missingno10, modified by Robbiecrone. Good luck! Currently version 2.1!