hey
Looks pretty nice, well I think it's a brave feat to continue in the footsteps of Doukutsu Monogatori [Cave Story], as it wa such a great game!
I myself have looked into the Doukutsu Monogatori Sprites and Tiles before, and to me they looked very well done, with great style. Hmm, well I have no great concerns with your pixels right now, well your tiles look to lack highlights? edit... also, I was just thinking your tiles look rather flat? but yea, still early days... would like to see how this all turns out.
But yea I also would like to make a game alike Metroid or Doukutsu Monogatori, but nevermind that.
cya