this is happening because htlm5 cant handle gles3 which is a quality preset in godot. to make it availabe for mobile player as i am too lazy to setup export for andriod(i have now setup andriod export though but cant give the apk becasue of signing issues wait for it come for andriod)
therefore i had to use gles2 in which particles are not support and that why i think you can see bullet in the browser version of the game. plz try the windows version i have used gles3 their so you can se the bullet.
by the way godot is bad for making browser games. :)
thnx for playng