Bare with me, im on my tablet and typing is a pain. Your game worls really well. The logic is down. I would recommend speeding up the cpu time. it feels slow but im also impatient. I think if you do some polishing it it you would have one damn fine game on your hands. Change some of the fonts and make the score board look better. Im also not a dan of the start button. I think something better could be done for that. All in all, Im being picky to offer feedback. Its well done and it got me sucked in for a while. You did a good job emulating Simon Says.
Edit: wow.... me and touch keyboards do not mix. Ill try and remember to offer better feedback tomorrow when im near my laptop,