Not too hard, but you can easily go out of order on a few things. Also, you can add the wires to the box without opening it skipping two major puzzles. Another decent escape game overall.
I love waiting at the finish line for the rest of the racers. Those weirdos always seem to come flying in upside down or rolling when there really isn't any obstacle before the finish line.
The genre has come too far to be lacking certain elements that ALL tower defense games should have. Speed up, target priority (that works), and simple layouts and/or pausing to layout towers is a must have.
"TIP: Use your restore mana spell so you can use more abilities!" Or just wait, as the game stopped the enemies ATB bar, but not your mana regeneration.
You know, this has potential to become the next breakout hit. I mean it. You should invest and get a team together. I'd pay 20 bucks for this once it is polished and has more content.