GB Studio has a great export to HTML5!
It is even mobile-friendly. I bet you could get more feedback if you made an build with that (just don't add a whole bunch of content)
I really like the kaiju design at the end, and your title screen is amazing for a Game Boy! :)
I think there is a different way to do the dialogue boxes so that they don't go all the way down each time a new line happened. But awesome start!