Keen 1 Mod -
A Keen 1 mod originally intended as an entry for a 24-hour modding contest in 2010 that spiraled into a full mod. It took about three months, which was still an accomplishment given my usual decade-spanning (and counting) development process for other mods. The basic graphics were already designed a couple of years earlier for a vaguely conceived minimalist retro themed mod idea, and the contest gave me the impetus to put them to use.
Note: the bugs identified in VBB's YouTube video were fixed afterwards. Though the game is still extremely difficult in many areas despite a lack of reflex-oriented challenges.