If there was a game jam announced with the theme of "Snake taken further", Sub Dragon - link HERE - would be the first entry in it. Furthermore, I would personally nominate this one in the category of "intelligence in design", on another occasion. What the Sub Dragon is, is a peculiar but explosive mixture of Snake and Contra, done modern justice, post-retro style. In gameplay, it elaborates entirely on one single topic: half of your body is bulletproof but cannot attack, the other half can attack, but is vulnerable. Combined with the fact we pilot a creature moving in a fluid, snakelike manner, we have a good challenge ready to be worked upon and Sub Dragon, it works the material just right.