'Fancy Cube' is a game about reaching the green cube and avoiding anything that's red. Difficulty can be described as moderately hard. Every time something red touches you, you explode into small little cubes and your death count increases. If you want to reset the count to 0 just load a new game from the menu. But this will lock all the levels again. If exploding all the time is really stressing you out, just keep calm and listen to the somber music and ambient sound playing in the background. Good luck!