Ctrl for crouch is pretty terrible choice for the web version. W is forward. Ctrl+W closes the tab in Chrome (at least on Windows).
Any way to remap in the browser version? (no, I'm not going to not download and run a game from an unknown developer)
The Ctrl key is used to toggle the crouch mode and does not need to be held.
That doesn't really help. You're bound to hit them simultaneously sooner or later.
As I did. Twice. 😑
