oh my god... IMPRESSIVE!. the stage is wonderful. i dont imagined those boxes will be for that!.
the stage is super cool and looks very professional. man you are making a piece of art, at least in aspect and originality.
and also, the background is beautiful. i dont know from where you get it, but is perfect for a turtles game.
by the way, this boxes remenbers me to iron man 3 and eraser movies, with that cool scene cutting the chains.

.
that could be an idea for a boss. in fact, im sure i saw something similar playing a similar game. maybe was on the simpsons?
and also was another scene using those containers on a van dammes movie and lethal weapon 2 too.
also, thinking about this, i saw this moving boxes objects could be very useful for many rare stage ideas.
since a traffic jam, to even an space asteroids stage, jumping from one to another. like on that "journey to the earth center" movie (on the magnet rocks jumping scene).
a very interesting situation could be too add gravity there. like on that arcade machine fight of "kung fury", when they reach a satellite fighting in the space. hehehe
jumping ballons during a race, jumping from airplanes... man, theres a lot of crazy things where that idea could be used for, creating rare and special platform stages.
in fact, those ideas makes me remenber even the tragic september 11.
now that the time was passed, i always tought that could be cool, that at least on a game, you could prevent the world trade center attacks. entering on the hijacked planes and kicking the butt of those terrorist scum.
maybe more than the turtles, the favourite character for do this could was the punisher and wolverine.
but anyway, could be cool can change the history, at least, on a videogame.
and demons, why not? with the turtles sure will be cool too.
in fact, do you know it? theres an unused bonus stage with a airplane hijacking on the punisher arcade game.
but you cant access it without use level select and inf time pro action replay codes on mame.
greetings.
ps:
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please... i dont wanted to annoy none with my comments.
of course i respect all the september 11 victims. but today at 2015, this is saddly history...

even when it looks like this happened just yesterday.
i care about people, and thats exactly why i think on fantasy matters about those situations.
...about how could was is the history was different on any tragic terrorist happenings like this or in my country spain. (we also suffered too another one with trains if you remenbered it).
so lets say, that im thinking on a "source code" movie style. but with all the respect. you know.