Great job. It's like HERO got ported to the SNES!
It's very faithful. No complaints in that regard except perhaps when trying to go down a 2 body width hole with an enemy it was harder to avoid dying. I recall being able to not overshoot the cliff. But perhaps I'm rusty.
Being able to dedicate the dynamite to a separate button is nice. But I was a little disappointed when after doing that I could no longer press down to use one. I guess old habits never die. I could see how newer gamers (and by that I mean people who at least started on the NES) could get discouraged by accidentally using dynamite when they press down at times. Perhaps make it a separate option. Or make it obvious how I can skip a button configuration.
Keep going! Playing your game makes it very easy to think about all the cool ways HERO could get enhanced even further.