I liked it. It's simple, to-the-point, and moderately fun. It also probably took a lot more work to put together than one might think just from looking at it.
Also, there is an interesting "hack" to me, but it's sort of a stretch. Notice that the game powered by the Box2D physics engine. It's cool to me how that physics engine has revolutionized 2D games in a small way. Erin Catto, its creator, decided to open source it, and now suddenly we have hundreds of games that have been able to experiment around with physics in gameplay. And new gameplay in small games is just one step away from new gameplay in AAA titles like Half-Life 2 ... Portal was inspired by a small game that a few Digipen students created for their final project, for example. (It's called Narbacular Drop. Check it out -- it's fun! http://tinyurl.com/5m2qtp)
So I think we should encourage people to continue experimenting with new gameplay ideas... hint hint.
IMO, a video game that goes to the 1st place on Hacker News' front page has to be clever, not fun. Having this game make a very simple (and typical) use of physics doesn't make it terribly clever.
If you want a "clever" (read: interesting; read again: intellectual; read once more: poignant) game, play Chess, or Stratego, or Risk. If you want a game that's not fun, well, I'd probably just say "lighten up".
I'm with you.
I don't get it... The physics part is pretty minimal and doesn't seem to bring anything to the gameplay: the "corpses" don't really slow you down and the fact that your "bullets" can hit on the way down don't add much either.
Oh well, it's Sunday.