Chaos! And more chaos! At times it's almost like metroidvania meets pinball (Sonic Pinball anyone?).
I'll start with a +1 to Jordon O & Co.'s thoughts.
In addition, I think with some thoughtful level design to guide the player a little more (I wondered around forever and had no clue if I was going forward, backward, or in circle), a bouncy, chaotic, open world game could turn into quite an interesting premise. Creating some distinctive landmarks or areas (simply changing the color of the wall tiles) would do a lot for help the player navigate as well.