Hey! Glad you like it, I'll check out the game!
The alpha filter was a fix so that the game looks right on Chrome - without it renders the text blurrily. With it in place, I believe the reason for weird rendering and totally unreadably thin lines is often nonstandard characters like am em dash or an ellipsis glyph causing subpixel spacing afterwards, if that helps at all! But if your fix to just remove it on firefox works for you then great :)
