Dear cactus has released another shoot ‘em up. Ad Nauseum 2 (direct download) features seizurific special effects, some slightly obscene artwork, and a soundtrack that I’m pretty sure is meant to induce bowel movements. It’s also very easy to die. You have been duly warned.
For those new to cactus, you may want to try out Cactus Arcade (direct download), a collection of 17 of his games, including a handy interface for playing them.
(Thanks a lot for the tip, Bas! And to the various peeps that brought Cactus Arcade to my attention.)