I don't really see the point of the game except for that one boss fight. My first complaint is about the counter-intuitive controls, especially in the early Windows version that I played, it seemed very incomplete (text display bug, game randomly crashes when you select "exit"... apparently you have updated the game since) so I was stuck at the first text box because I could not scroll the text and I thought the game was broken. It took me a while to figure out I had to press "up", it's not obvious and it was not explained in that version of the game.
The most frustrating thing, to me, was when you attack the birds, sometimes they hurt you instead. I did not think I would become so scared of little birds. Then the boss fight went on and on, I still had to avoid these birds, it became tiring. I would say the boss fight is too long, but then again it's the entire game, so it would only make the game even shorter.
Lastly, I thought the story did not really make sense, the poor English did not help.
I liked the characters and the retro GameBoy style of the graphics, although the boss sprite might need more polish. All in all I am not sure what to rate this game, it's clearly just a prototype of a single boss fight. I'm still curious about the game universe, I look forward to an actual finished game that comes out of it.