I just finished the game and love it so much! The plot is very interesting, and it was fun getting to explore and interact with things. I've been playing visual novels lately which aren't nearly as fun as something more interactive like this. I wish it was longer though because I got super into the story and characters, but it only took me about three hours to finish. I played it in two sittings though which made it last about a day. At some point before too long I'm going to play again to get the secret ending. I'd love to see a sequel someday! It would be awesome to get to visit Atun, and for Toa to visit Earth.
I have a little suggestion for any future games you do. It would be helpful to put a fullscreen option on the menu, or to mention somewhere that F5 is the button for it. I was extremely disappointed that I couldn't play in fullscreen the entire time, and then discovered right after completing the game that I actually could have from seeing it on the guide. I only went there to see how to get the secret ending, and I'm sure a lot of other people didn't realize they had the option for it as well.
Also I was wondering if the soundtrack is available to download anywhere. I adore the music.