Interesting. I wonder if the input think was an issue with keyboard layout. I thought I made it a "physical key" but everything was such a rush that I may have messed up that one particular key! I'm glad I was able to include key rebinding to get around that one but sorry to hear that it still didn't work in spite of that. Hopefully over time Godot 4 web exports will get better as the left/right getting stuck appears to be an engine bug that doesn't happen outside of web builds.
Thanks for giving it a try and leaving feedback!