Combos

Laser Combos

 * Laser + Beam = Giant green laser.
 * Laser+ Beam + Sun Beam = Gigantic yellowish-green laser.
 * Adding the Cannon Ball Upgrade to Beam Upgrades it so that it can pierce enemies and fire an additional beam behind you with the length determined by how far you aim your beam. (Note that this combo might be a bug as it doesn't seem to really work, the laser shooting behind you usually does no damage and your beam usually doesn't pierce.)

Combos that apply effects to your bullets

 * If you combine the Ice Bullets and Fire Bullets, it will create green pellets that do 5-30 damage and trap the monster inside rock.
 * If you combine Ice, Poison and Fire, it will do small amounts of damage, trap the monster inside stone, and shoot poison afterwards.
 * If you combine Ice, Fire, and Cannonball, your bullets will rapidly deal explosive damage when the enemy is trapped inside of stone. (The last part doesn't always trigger as this combo is slightly broken. Bullets shot out with this combo sometimes pierce enemies.)

This will cover 2-5 upgrade combos that are good to survive

 * Laser + Beam (Not so good because of its fire rate, the combo below this is recommended.)
 * Penta Shot + Laser/Beam (Best for most enemies)

3 Upgrade slots

 * Laser + Beam + Fast fire/Burst Shot/Penta Shot
 * Sun + Duel + Fast/Burst/Penta

4 Upgrade slots

 * Sun + Duel + Fast/Burst + Penta
 * Laser + Beam + Fast/Burst/Duel + Penta

5 Upgrade slots

 * Sun + Duel/Quad + Fast + Penta + Burst
 * Laser + Beam + Fast/Duel + Penta + Burst

Power Ups and Combos that decrease bullet speed

 * Ice Bullets
 * Cannon Ball
 * Cannon Ball+ Ice+ Fire (The slowest bullet speed combo, It also doesn't go really far.)
 * Cannon Ball+ Poison
 * Cannon Ball+ Ice

Power Ups that increase bullet speed

 * None

Power Ups and Combos with bullets that travel instantly

 * Laser
 * Beam
 * Laser+ Beam
 * Sun

Trivia

 * If the Cannon Ball power up is paired with Fire, Poison, Ice, or Shock, the bullet will look like a Cannon Ball with the colour change of the other Power up.
 * Speed values of bullets are changed by a multiplier system.
 * If you combine Cannon Ball+ Ice+ Fire, your bullets will travel slowly and not reach really far. This is the combo with the slowest bullets which also happen to travel the least out of all combo bullets.