So this game loaded up, and here are my thoughts: (thanks for the promo code)
1.) I like the idea of a game to check Twitter. I didnt like the idea at first, but only hitting star tiles to show tweets is pretty interesting.
2.) Movements are very fluid. The slow-down effect when a Tweet shows up is just great.
3.) Have you considered as levels advance, to incorporate multiple retro-styled games? Maybe asteroids after 5 levels, etc? Of course this would require a great deal more development, but done in the same style - it would give significant reason to play the game to the end (and keep discovering hidden games)
4.) The bit graphics are done quite a bit now, and overdone in some cases. Yours are good, but I think they could be sharpened up a bit, especially for a retina display. Pixels are great, but there is a healthy blend of using colors that pop with pixel graphics (see League of Evil).
Overall, awesome job.