1. Don't evade enemies' bullets early. Evade only when it is about to get hit. If you evade early on, enemies bullet will be traveling everywhere you were at and you will make less space for evading.
2. Don't evade too far. If you evade too far, You will be spreading upcoming bullets to everywhere.
3. Don't use bomb when the bosses are transforming. A best time to use a bomb is when the boss is shooting a large amounts of bullets. Wait for a moment until some bullets are about to hit you. Then use a bomb to clear all bullets up and also damage to the boss. ( If you are controlling the ship with one finger, Use a second finger to trigger the bomb )
4. Don't collect some power-ups as soon as they appear. Leave it on the screen. collect power-ups at a right timing to prolong effect or better profit. Here are examples.
--> Stars- power-ups. Don't collect when you are using laser-shooter. Leave it on the screensfor later use.
--> Health Restore. Leave-it on the screen. Use it is about to disappear or you are about to die.
--> Armor Power-ups. Leave it on the screen when there is less enemies. Use it at the start of enemies' wave.
--> Weapon Power-ups. Wait for the right color ( Green / Blue / Red ).
5. Don't waste your last ship by bosses' attack if you have lots of bombs. Just use them to defeat him. Every boss will give you one extra life.
6. Weapons Power-ups. Collecting same color power-ups will increase weapon power. ( 4 Steps ). Collecting another color will change the weapon type but it will not increase the power of weapon.
--> Green: Homing Missiles, Good when you only want to focus on evading enemies bullets. ( Max 5 homing Rockets )
--> Red: Very Powerful, Very good at Killing bosses at a short time. ( Max 12 Rockets )
--> Blue: Good at clearing small enemies' waves.