Haha, yeah, I didn't make sprites for the Tunnelman or Damsel yet, I should do that at some point. I didn't think to test against them since I haven't unlocked them yet (how are you supposed to do that exactly?).
The damsel is unlocked when you save a certain amount of damsels (I don't know how many, exactly, probably 7 or 8?).
The tunnel man is unlocked when you unlock all the doors in the High Scores room, I think, I'm just guessing as I never unlocked him legitimately.
Anyway, good luck with this project, Dujj!