Loved Lemmings, played it every morning at school when I was 9 and 10.
The fun of it wore off a bit when I came back to it a couple of years back and beat the whole thing within a few hours, but it was fun while it lasted.
I got a 256GB Samsung 840 Pro, because I kept running out of free space on my 60GB Vertex 2. I figured I'd get the extra free space for provisioning and future-proofing, but I don't think I'll ever use more than 100GB of this drive before I move this to a laptop or replace it entirely.
I thought it had more to do with the hardware rather than the actual software. As in, number of extra chips that need to be validated, speed of data transfer to CPU, etc.
The only way I can imagine demos hurting sales is if the demo is actually enough for people to get sick of the game. Then, either (1) the game sucks balls, or (2) someone screwed up and made the demo way too big. Either way, it's the company's fault.
As it so happens, the Kanji characters are also the Chinese characters for serenity as well...and I am pretty sure they're on the wrong way.
Otherwise good work :)