Try and keep at least 2, preferably 3 or more captured bugs into the bonus stage. There's alot of points to be had on the bonus stages, if you max out the hits (165). You get extra bonuses if you can at least spell out the word. During the regular stages, every so often, a queen Gaplus will come out from the top right with a piece of a ship. If you can get all 3 pieces, you get an extra ship.