Noted! Thank you for your feedback. By the sprite filtering, do you mean the outline around the sprites? The outline width isn't that big, so I'm surprised it bothered you that much. Maybe it's showing up differently in yours in the HTML5 version?
Nope, I mean the "blurry" effect on the character sprites. You can fix it by reimporting them and turning the "filtering" option off. The sprites are pretty good by the way, I just can't stand blurry pixel art.