Yet another shooter? Yes, but this time with Tetris-esque elements. Invalid Tangram is a 2D game that's part vertical shooter and part puzzle. The design, programming, and art were all done by Josh Szepietowski in 2005, and uses vector rendering to produce its original graphics. Invalid Tangram was chosen as one of ten Student Showcase Finalists out of more than 100 entrants in the 2007 Independent Games Festival, and is well worth a look.
Click here to download Invalid Tangram (1 MB).