Fun to play a health bar would be nice.  The animation at the start looks good but it's a bit hard to understand without reading the story

Here is my list of possible improvements for your game:

• I didn't really understand the cutscenes until I read the story. Maybe some audio could have helped.
• It is hard to understand why you die. You should definitly add a health bar
• The game is a little too punitive. Sometimes you manage to get to a green surface before dying and you die on it without understanding why.
  If there is some kind of health system in the game, when the player gets on a platform, you should give back enough of his health so he doesn't die. Then you slowly fill the health bar as he stays on the platform.
• Finally, when you finally manage to move fast enough, you get to the end in 10secs. You should try to make the game way simpler at start and you get to the current  difficulty at the end of the game.

Sorry if I was too direct, I like when people are frank with me so I tend to be that way with others. I hope it will at least help you get better at game dev :) Keep it up!