Damn. I would have enjoyed the challenge of that. But what made it too hard, if you remember? I only noticed mention of a secret area to reach the silver key.

I had to simplify some puzzle and some area because it was a bit too hard to be fun. But nothing really big, just small adjustment. Now I think there is a good balance.

Was any difficulty reduction/change related to enemy fights, traps, obstacles, etc? Or just level layout and progression?

Hi emjeeman.
I seriously doubt that I have it anywhere. I did a cleaning and renew of hard drives recently and I only remember having the final version, that is this one.
Anyway you aren't missing anything amazing.

Would you happen to have a copy of the original version, with the more difficult maze?

Thank you for your feedback, tcassat.
I wanted the levels to be progressively more complex. In the first one I wanted to experiment with narrow spaces and long hallways, which is something you don't normally see in the original game.
I may consider changing the secret silver key access passage to a normal lever-door access. I don't know why I put that in there. I guess I was improvising.

I finished the campaign without saving, on the highest difficulty with all the "vanilla" game mechanics. I liked the levels, I think I did them all (I don't know if there are any secret ones).

I personally liked the later levels better (from the third level onwards). The first one is the only one I found a bit "meh", there's a maze-like design to it that I'm not a big fan of, and progress depends on noticing a secret passage, but it's not that hard to find.

I haven't checked it out, but I think it's possible to skip that whole night city level by jumping over the fence at the end with a rocket jump or with the dog (bark + use). I wanted to check it out, but I still haven't figured out how to select levels in this damn game so I'm not sure if it's possible.

But all in all, good job.

Feedback is always welcome!