Thanks for the feedback!
I can see what you mean about the "So bad" being confusing. I tweaked it a little for clarity. Sometimes its hard to see those things writing in a bubble! So its good to get the broader feedback!
Unfortunately that font only has the one weight. However I have modified the CSS so the letterforms aren't so crowded. Hopefully that'll help a bit with legibility! Cheers!
The font on the buttons are much more readable to me now! I checked in Firefox and Chrome and it's looking good.