Some of courses have you dying immediately. Which creates a very difficult to escape from loop, as the timing becomes confusing from the constant disappearing and reappearing of the square. The music and visual presentation are excellent, however I can't appreciate that as I can't progress very far into the game.
This game type has been done to death, and additional entries into its rather limited genre need to create elements that set them apart. Horrendous level design isn't one of those things.