Hello there. I've registered exclusively in order to provide you with a little feedback.
I have been eagerly awaiting the day when DD would be released on the iOS. But I don't have an iPad, which resulted in serious disappointment. I am also not willing to buy one so I can play DD, naturally. Pity, because I was poised to buy the game the minute it came out.
Someone else already approached the idea that, if the screen size is the problem, some of us would be ok with being the judges of that. Well, I second, third and fourth that sentiment. I've played, in my iPod Touch 5...
Monkey Island 1
Monkey Island 2
Broken Sword 1
Broken Sword 2
Tomb Raider 1
Tomb Raider 2
Lara Croft Guardians of Light
Darkstone
Gemini Rue
Inherit the Earth
Beneath a Steel Sky
...etc, etc, etc. I would very much prefer to have a say on whether playing on a smaller screen is acceptable - because I'm the one who's going to be buying the game (or not...), and I'm the one who is best placed to judge whether I should invest on a new, expensive piece of hardware or whether I'm comfortable enough with my existing hardware to put up with a smaller screen.
I understand the whole point of DD is that you can see the whole screen at once. I also understand that you'd be loath to hardcode some special functionality in, like panning and zooming. Well, some of us would be *very* grateful if you'd take that extra step. Grateful enough to buy your product, which at 10$ is definitely in the "Well, it's a bit expensive... I don't know... ah screw it, I'm buying it, it's awesome enough" region.
I'm not posting to change your minds all by myself, of course.

But I do hope that eveyrone who feels the same way comes here to post about it, so you see that maybe it's not a minority we're talking about.