your on your way
pretty good i enjoyed it till the end but i was disapointed to find that it ended so quickly. You had a good solid gameplay for a game like this but there were a couple of problems. some hints would make it a little easier to play(i had no trouble but some might become confused). an actual alarm sound would have been nice. and definetly extend the game's story and length. I also suggest adding more new elements to the game. Granted you had some but there wasn't a steep enough difficulty slope between levels.
but in general your game was good and i was happy to play it considering all the crap that gets submitted. you are well on your way to becoming a successful game creator