The animations and art style are really slick!
After defeating the boss and getting destroyed by the suit guy, I got stuck with a purple background and the main character was nowhere to be seen (end of the demo maybe?). I also found the big guy to be much, much easier than the sword one. Spamming normal fist felt op compared to kicking.
This is how it looks on my end. Currently I'm using chrome to play in windows 10. Maybe this is related to the game playing in a browser, some functions of the engine might mess up with html5. My godot game worked properly on desktop but crashed in the browser every time it called a function to get a random float number. A quick workaround fixed it. Maybe you have a function that is not browser friendly for some bizarre reason.