Really good game! Took a while to get a hang of the controls, but once I did, it was quite a lot of fun! Feels like Getting Over It, if it was more relaxing and not rage-inducing haha. I got to about 4000m before stopping. Well done!
As others have said, the webgl version simply became unplayable. You have mentioned to others to download the local build, which I did. However, in the future I think it would be better if you either altered the webgl build so it doesn't have the performance issues, or don't include it at all.