Invincibility
Hold Z and press R, R, L, L, Up, Down, Left Right at the title screen

Easy killl on the Bees (Hint)
After you hear the buzzing sound to notify you of the bee's arival you must wait for them to get very, very close to you (ie. when they swoop down to hit you). Use your weapon with star-type ammo to shoot them. You will hit them 99.9% of the time. If they hit you, no worries-you won't lose much health.

Fast moving text/skip text
Press Z to fast forward text or A to skip entirely

All Weapons
Press Left, Right, Up, Down at the title screen. Then hold Z and press Right(2 times), Left(2 times) then while playing the game press a+b+r

Level Select
Hold Z and press Right, Down(2 times), Right at the title screen. Release Z, then press Right, Up, Down, Left(2 times), Up, Right(2 times).

Unlimited Lives
At the title screen press L, R, B, A, Z, Left, Right

Refill Health and Ammo
While playing a game, press A + B + R

Level 6 Gun
On level 6 pick up the nuclear device then while carrying the device, fly towards the mountains to a steel like drum. Fly over the drum and you will get a special gun

How to Kill The Evil Heard Queen
To kill the queen just fly real high and shoot her in the head,she has another body! To kill it shot in the head then run if not you'll get killed so keep repeating and you'll beat the queen!