У вашего броузера проблема в совместимости с HTML5
This is a custom mission made by me. It is too hard to play with normal upgrades, so the server should use doubled upgrades. That's the result. We still failed, but it is beatable.
Download: https://www.dropbox.com/s/c6uxnahylv6bavy/mvm_mannworks_boss.zip?dl=1
Just drag the tf folder to your server/client's tf folder.