Thank you!
Yes, for some reason I encounter these bugs when web exporting. Not sure if I'm doing something wrong or Godot just works like that but I have no idea currently of how to fix that (and since I didn't have anyone but me to test, I couldn't really know that lol). As for the sounds, I wanted to implement them at the last moment, but got distracted by the fancy menu animation. I did make one music track but since there's no sound or other tracks I decided to not include it. Glad you liked the patterns! Implementing bullet patterns system probably took the most effort and I was choosing between polishing it or making more levels.