So Kero Blaster is apparently pretty much finished, despite Daisuke "Pixel" Amaya (Cave Story) originally scrapping the entire project (known as Gero Blaster) and doing the whole game over. It stars a businessman frog and his boss, an angry cat woman. Reminds me of Executive Koala.
Cave Story fans might be a bit sad to hear that Kero Blaster is less Metroidvania and more straight up 2D action game (Contra), but stuff it, there are a million and a half Metroidvanias for you to play. Meanwhile, I can't even get a third Bushido Blade.