The game was Synapse (possible translation: ?????). Despite it having a couple of game-breaking bugs and a possible DMCA filing, I look back at this one fondly. Thankfully, I had a compiled copy of Synapse in one of my backups (not-thankfully, I lost the source code).
Anyway, if you're interested in a neat little brain-twisting puzzle game, here it is (or at least until Flash is forever disabled on all web browsers).