I've played it and finished it!
It's very well implemented, the puzzles are of the classic type that you'll know how to do if you've played this sort of game before, and the graphics are top-notch (and dynamic, so suitably story-enhancing).
The only negative, really, is that I wish there was more of it! It's rather short and I finished it very quickly. But then again, I know what I'm doing with these sorts of games: it would probably work very well as an introductory game for a less experienced player.
Re the 8 bit compatibility that you mention on the game page: I don't see any major issues in converting it to 8 bit if someone was so minded (I don't see major 8-bit incompatible complexity there), but I know that's not your interest. Incidentally, it's not really mine either. I love the ZX Spectrum but Adventuron is too good and capable, in my opinion, to shackle it with the sort of restraints that 8-bit compatibility necessitate (and I did manage to do almost all of my game in 8-bit compatible mode, until I basically ran out of memory).
One other thing: you might consider having 'swing' as a verb rather than 'push swing' (the former feels more natural to me, and I tried it first).