It's challenging... BUT IT'S SOOOOO MUCH FUN!!! I really loved this one.
I don't agree with some of the comments, in my opinion, changing mode with a hotkey would take out the stressful part of the game, which makes it so exciting.
This game would do great for Levels with different objects to collect/avoid and mazes.
I liked the music and sounds as well.
My personal best is in Hard mode 19.