you already know about the upgrade screen issue so i'm not going to mention it here. i believe the sound settings never really did anything, and closing that menu seemed to freeze the game so theres another bug to watch out for. now on the positive side, the game is super charming both with audios and visuals, the style it has is super cool and reminds me of old flash games in a way, while the gameplay is obviously very arcady as is the cover art.