I am very happy to announce that Redshift can now be played on Google Chrome, Microsoft Edge browsers, As well as any other browser that has dropped support for the Unity Web Player.
WebGL is still in an early development state, as such we recommend you download a 64 bit browser for the best experience right now.
Firefox 64 bit (English): https://www.mozilla.org/en-US/firefox/all/?q=english
Firefox 64 bit (All Languages): https://www.mozilla.org/en-US/firefox/all/
Chrome: https://www.google.com/chrome/browser/desktop/index.html, then pick download for another platform. Finally under "Download for another Desktop OS, select the one for your operation system.
We are going to be continually improving performance for the game over the coming months as well, as we migrate to WebGL fully by the end of this year.