Great! Just great!
Very nice game, I liked the fact that you could choose the ending, and that it was so similar to Doukutsu. (Cwhatididthar?) Gave me just the shot of nostalgia i needed, though I'd like the next one to be atleast comparably long to Cave Story, as i am assuming that you will release a full version of sorts. If you just build on this engine, work on the story a little and add a crapload of weapons, it'll be able to actually COMPETE with Cave Story.
Keep on keeping on, my man!