There were fatal technical problems with this game using the Firefox browser under Linux OS, but after using a different Chromium-based browser it seems to execute smoothly without issues.
I love the concept or idea behind this game. It does a great job of incorporating the gamejam's themes of "edges" and "unstable". But even beyond the gamejam's themes, the concept behind this game holds a unique theme somehow. Furthermore, the game's overall simplicity is one of its greatest strengths.
Unfortunately however, its merits are overshadowed by sluggish, inaccurate controls which make the game practically unplayable. If the controls could be refined, it would make the game so much better. It is almost impossible to control the hero to make him land on the small platforms as his movement inexplicably and harshly accelerates from slow and sluggish to very fast and beyond control. I don't know if this resulting level of difficultly was intentional or not, but I find it to be far too difficult and presumably not part of the game's intentional design, unless I am obliviously overlooking something.
The graphics, while minimal, could be improved to include some animation. That would go a long way to improve the overall appearance of the game in general, even if just a few frames of animation for each main character or main object.
Overall, this would be a more decent game were it not for its overly difficult controls. In that aspect, its gameplay mechanic definitely needs to be improved and refined. Again, the game's theme and premise is good and almost precious, and alongside that the game's somewhat simplistic overall concept is one of its greatest strengths. It was a privilege to try out this game, and it showcases the creative endeavors of its author. Great job overall!