http://www.konjak.org/index.htm
Plays pretty much the same as Cave Story except it looks prettier and it's a Konjak game.
If you've played any of his other games like Legend of Princess or Noitu Love, you know what to expect.
Edit: Oh man, the second boss fight is intense.
Looks nice, downloading.
I'm very jealous of Konjak :c
Edit: Its pretty meh imo. Graphics are nice, music is repetitive, gameplay and concept, like konjak said, are unoriginal. Wasn't bad, just not the funnest thing he's made.
The music's a bit grating after a couple loops, and maybe I've just easily entertained but I rather like the simplicity of the gameplay. Bosses are also great as ever, and the wrench puzzles are really cool despite just being a little gimmicky.
I actually haven't beaten the second boss yet but it's a really intense fight.
I hope he releases this one sometime.