This is a video of me, Tasselfoot, getting 3 stars on each level of Blosics 3. I am aware that you won't have unlocked all of the weapons I use to 3 star each level... however, playing through the game normally will get you enough stars to unlock them and then you can go back and 3* stuff. Beating stuff with 1 star is really easy!

Game: http://www.notdoppler.com/blosics3.php