Great game! When I got to the "Ice" levels I thought to myself "oh s**t there's going to be a run-from-the-wall level but with saws!" but that level never came. :(
I think you could mix up these "dangers" even more to get some new challenges (maybe even on the existing maps). Don't be afraid to make it even more difficult since there are probably many players like me out there, that just love the hard games in the style of "extra-fleshy-male-child".
Otherwise the controls are spot on, everything works, just awesome!