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The browser version doesn't have the start where the whole situation gets explained. The Windows version has this.
The true ending also doesn't seem to work in the browser version; I tried twice.
Same as the second and third dream; Both are missing on the browser version, but present on the Windows version.
Same as dead end number 7.

Very cool game though.

Same thing here. I tried it twice in Firefox ESR.

On Linux Mint 19, you cannot turn around using the mouse. I am guessing that the mouse movement just stops, because the cursor hit the end of the screen.