Thanks! I heard to movement and level design issues.
In the first time I decided to implement a movement with momentum like Super Mario Bros. or Sonic. This is should give the game more dynamic. While testing this game, I forgot about the other players. That's a reason why my game is very challeging. I will be cosider about playtesting the next time.
Anyway, I fell like growing up in this game jam. This is a hard but a great journey to development a Run or Boom.
And thanks for your feedback. Maybe I will be change a movement and level design or not, I don't now. :)