Greetings again, please try again it should be working right now. Apparently there's a restriction for Spritesheets, one of the truck's animation was 31 frames and it worked only when I cut it by 30%. Prob it comes from the fact that this spritesheet is 640x31 = a hell lot of pixels, so to prevent extreme memory usage it did what it did
Blank screen: can you please provide the steps to reproduce since I can't quite do it myself, unfortunately
Music: apparently there's another bug with exporting into Web version - if you like to play the music again just hit the SFX button once it's stopped
Sorry for the bugs but yeah. Sad that I couldn't foresee them since there was no problems with exporting on previous Godot versions