10 total levels, you'll know your at the last level because you'll see a big monolith structure, and then when you run to the monolith, you'll be taken to a "Thank you" screen. I just replayed it myself to see if I could recreate the glitch, but I was able to make it to the end. Someone else commented about the glitch too, so it's definitely an issue. Sometimes Web Builds are weird, though. Not sure exactly why.