I gave the demo a whirl and was impressed. It already surpasses many shareware era platformers.
I noticed some issues with the ladders. You can exit them too early. That's OK. I had similar problems with Inferno. Easy to fix!
I really like the music. It's proper use of SID sounds.
My only complaint is that you can't duck. I want to duck under the bats, but can't.
Presentation and aesthetics are straight up 1993-4 era DOS games, though. It's pretty good.