First up… Please don’t make Ctrl & W controls that players might press together in a browser game; on Windows that closes the browser tab and then there’s a 65 second scene setting audio clip to go through when restarting.
I didn’t play it for long because the aforementioned Ctrl+W issue took a lot of my patience away, and the visual effects aren’t great for someone who had a migraine a few days ago (as is the case for me atm), but that said you’ve got the start of a wonderful Portal style game here and this is good work.