I've just completed adding a mini-game mode. It's finished and currently in play-testing, my friend 'Simon' says is quite fun!
You can play this memory game with as many laser beams as you like, which gets pretty tough as soon as you go over 6 beams.
Based on feedback left in the review section I've also reduced the attack time of the sample allowing for much faster playing of notes.
There has also been some rendering enhancements to make way for interactive control of lighting and fireworks coming in a future update.