UFO System summarized:
-Combinations come in 4 forms: Multi-colored, Red, Blue, Green
-When an incompatible UFO is obtained as the 3rd UFO, the first one is discarded (e.g. if you have 2 Red UFOs and suddenly get a green or blue one, or if you have red and blue UFO and then get another Blue or Red one)
-When you form a compatible combination of 3 UFOs, a UFO will appear. This UFO has an item magnet and set life, and you have 10 (12?) seconds to destroy it.
-If the UFO obtains a certain number of items (I don't remember how many), it spits out a bonus depending on what kind of UFO it is (explained later)
-you have to kill it within the time limit or else it will just fly away with all the items, lol.
-If you manage to kill it, all items it sucked in will magnetize to you, point items get maximum value, and bullets near it will be cleared. If the bonus is activated, a larger area of bullet clearing happens.
-Different UFOs give different items on kill, but all of them spit out a UFO of their color (but switching) on kill:
---Red UFOs drop a Player fragment. Getting it a bonus spits out another player fragment.
---Green UFOs drop a Spell Fragment. Getting it a bonus spits out a Spell Item.
---Blue UFOs give you insane points. Getting it a bonus increases its multiplier on kill.
---Rainbow UFOs don't spit out anything extra unless you get the bonus, though it does have a score multiplier but not as high as blue UFOs. Getting it a bonus results in it spitting another switching-colored UFO.
-UFOs have a hitbox, don't forget that.