Go to options and increase your bomb stock to 5. Also change the difficulty to EASY. While playing through the game it should be generally easy not to die. Keep a sharp eye out for arrow shaped projectiles and use anchoring to destroy red ball projectiles, or simply dodge them.You can also graze projectiles which basically means you can touch them but not directly and you wont die.If you are about to get hit and have nowhere to go be sure to use bombs.There is an extra bomb on each level and you can hold up to 6. Just make sure you have 5 before collecting it. Only bomb when you REALLY need to. And remember if you gather a bomb when you already have 6 then your not bombing enough. Try bombing at least once per stage, if you avoid using it throughout the stage then use it on the boss of that stage. Complete the game without losing a heart and this will unlock after the credits.