I don't even remember Pixel Junk Shooter having bosses. I loved the hell out of the first game. I 100%'d it all at release, but when I loaded up the version free on PS+ I just couldn't be bothered with it.
Man, Strider... That game is the best 2D flippy-jumpy-fighty game since Mark of the Ninja. I do wish it was a little more like the older games though. (not the terrible NES one) It kinda lacks all of the goofy enemies like cyber-mammoths and tarzan-ladies. I really, really wish the whole map didn't just look like Bionic Commando Re-Armed stages.