For the last room: put on the helmet, than choose option 3. Now assume that one of the aliens is the liar and the other isn't(it doesn't matter which). If you think about their answers and whether they're telling the truth or not, you should be able to pick the correct door.
There are no sprites you cannot get to. If you see some icy blocks which you cannot get to without the infinite jump, then those are journal entries, not sprites.
Just so you guys know the game autosaves so if want to continue your game just click play on the opening page, and then start instead of erase or back, and you will right where you were before you navigated away from this page or closed your browser.
From the beginning of the game I knew that something was wrong from the haunting to music and the bleak settings to the abusive things the kids mother said to him, but I still got chills after I got that final piece in the red room and the mother's messages started coming quickly. While being creepy these game has a beautiful haunting feel to it. Awesome game 5/5
The cop car is the hardest part and a close second would be the beach balls in London. This should definitely be an insane badge. I had 179 game overs.
I got all three in about3-4 hours. the last level I was on to get the Infinite and Beyond Badge took me probably at least a half hour. Now I am going to bed.
Try to install the "native" version of the UWP from developers site: http://unity3d.com/webplayer