Excellent conversion (as always). Great fun! I did donate, of course.
To second Mahisthans request, I'd like to use up for jumping, too, as I'm using one of those CompetitionPro-like joysticks (but with 2 buttons). I'd be happy to use the 2nd button for the ladders, though, so a WHDLoad option to just switch UP and 2nd button would be fine for me and (assuming) not so hard to implement.
Keep up the excellent work. Would "Ghouls'n'Ghosts" be possible to convert, too? I wasn't so fond of that port back in the days (as opposed to Ghosts'n'Goblins, which I already liked a lot).