Overall I like the labyrinth style - something new to the game! H.E.R.O. was always a little bit too linear and this adds some fresh variation! I always wondered if any new aspect can be added to the game like hidden passages or a new kind of monsters. But it would be a balancing act fitting the game…
I‘m also wondering and certainly mentioned it before if a kind of level editor would add something new as fresh ideas could be realized by the players what e.g. keeps Boulder Dash still alive.