Here's another recommendation, but this one is not unfamiliar to me. I'm sure that most of you have guessed, from the title, that Revenge II is a Jeff Minter game. That means you have a fair idea of what's to follow.
Revenge II - Return of the Mutant Camels is the third in the Mutant Camels series, following Attack of the Mutant Camels and Revenge of the Mutant Camels. It's a series renowned for its intense blasting action and this game ramps everything up to the max.
The game gives you a grid to conquer, featuring 100 levels. You always start in the top left corner of the grid, but once you've got through that level you can begin to choose your path. It's a great system, very Minter-esque, which means it's very difficult to get bored or frustrated. Struggling with a particular level? Just go around it.
The best thing about Revenge II, as with many Minter games, is the sense of discovery you get from playing through the levels. You never know quite what you're going to find each time. You know it's probably going to be unconventional at the very least, and that's half the fun. Whether you're being assaulted by giant telephones, marauding Pac-Men or massive returning Rorys, the crazy fun is never ending.
It reminds me of Jeff's classic Ancipital in that respect, and that's not a bad thing at all. The blasting never lets up and it's loud and obnoxious and very entertaining. And this time you get to buy extra weapons, too. Lovely. It all adds up to a top-notch budget title. even if you're not the biggest fan of ungulates.