The browser popup blocker stops the files from downloading. I had to manually allow it through in Chrome.
Once I had it downloaded on Windows, it was difficult to read the help screen, but once I managed to do that, playing the game was intuitive. The jump felt a tad too floaty, and took a while to get used too, but the platforming was pretty good once I had a few runs and could judge the distance a little better.
Looks great and the audio is nice. All round good job!