Yes thats right you can enter cheats in the game!
Except the continue codes you can also enter some cheats that you can do many stuff such as get a shirt or enter a seacret level. (yea there are those aswell which you can enter through 2nd , 7th and 12th level)
Here is the list of cheatcodes:
Yellow shirt cheat: gottagofast
Red shirt cheat: goinghigh420
Black shirt cheat: 612nodeath891
No enemies cheat: 098getaway926
Secret level ep 1: k8dh4878fn4
Secret level ep 2: 8fn45ubnd5r
Secret level ep 3: 2d9e5a8t2h7
And thats it buttt maybe there is some easter eggs that you can enter there. ;) ;) ;)
Mentifisto
I don't suppose the secret levels are the normal ones? So there are no passes for every level?
Flame152
Oh you can enter the secret level you just have to search for it when you open the door because when the door breaks the entrance to the secret level opens :)