I’ve been playing this Japanese indie game by Pixel. It’s a super fun Metriod style game. You roam around caves fighting monsters and bad guys. It’s all very retro and really fun. The graphics styled after NES/Famicom type graphics.
What’s unbelievable is that it was made by one person in his free time. It took him over five years to make it. I’m playing a PSP version that someone ported, but there also is the original PC version and a MAC version as well. You can get them at the Cave Story Tribute site. The best part is they are all free. They have both English and Japanese versions. The PSP version is here. Check out the trailer below to see the game in action.