I downloaded the Halloween demo last week, awesome stuff. I actually found it on your website before I found out about it from here (I check the Mr Beanbag site more often than the forums), and yeah it was sweet. My girlfriend and I love this game and can't wait to buy it. I'd prefer to buy a CD32 version, since that's what I use these days to play my Amiga games (I just stick Mr Beanbag on a CD and boot it up), but I'll just get whatever you bring out straight away and upgrade later if that's what ends up happening.
Have you found a publisher yet? I found a company (in the UK I think) that specialises in bringing out games for retro systems. I'll try and find them and put the link here if you're interested.
Hmm, I feel like playing that demo again now. Seeya!