built with processing
I've made a lot of nerdy things in my time but this might well take the cake. The phonetically spelled words drift down, type the word and press return to destroy it. It's not very polished (except for the way the solved invader collapses) but not bad for a bit over 2 hours.
In the pre-KotM time I grabbed the "2of12inf" word list from 12dicts, and then crossed referenced it with the CMU Pronouncing Dictionary at KotM-time. (I found a link to the latter when I was looking for some kind of downloadable rhyming dictionary file... I had a different game in mind but couldn't find the resources for it.)
The core game idea is kind of fun I think. It's an interesting challenge to phonetically suss out a word, and then it becomes a bit of a spelling challenge.