A neat pair of fangames by auvenom, created about a year ago.
Lemmings Returns:
http://www.newgrounds.com/portal/view/577897Oh No More Lemmings Returns:
http://www.newgrounds.com/portal/view/579063The twist: Your 8 skills are replaced by MS Paint-style draw and erase, which you use to scribble a path to the exit. In Lemmings Returns, you get unlimited use of the brush and eraser - sounds easy, but it's far from it! In Oh No you can only draw and erase in straight lines, and you get a limited number of lines.
There's just one downside though - no Fast Forward

. Apparently it was tried but it didn't work.
Thanks to möbius for posting a link to the video on IRC, it seems no one else spotted this until now.
I certainly like the music. That must be the DOS version of Lemmings!
It sure is

Interestingly, the author says in his comments that he had to lower the sound quality to save space, but it sounds good to me. *shrugs* Maybe I just don't have the ear for these things.