Here it is the list of presents that you can recive from defeating certian enemies. Any present name with a * next to means I am not compleatly sure about it. Check back here often scince it will take me a long time to put up everything.
Key
* = Unsure
# = You have a 1 out of 128 chance of getting it.
! = You will always get this item from this enemy.
Spiteful Crow - Cookie!
Runaway Dog - Bread Roll
Cop - Hamburger
Pogo Punk - Hamburger*
Attack Slug - Bomb
Black Antoid - Cookie
New Age Retro Hippie - Ruler
Ramblin' Evil Mushroom - Ketchup Packet
Mobile Sprout - Croissant
Lil UFO - Skip Sandwich
Spinning Robo - Meteorium#
Mighty Bear - Teddy Bear
Gruff Goat - Salt Packet
Cave Boy - Picnic Lunch
Foppy - PSI Carmel
Smilin' Sphere - Bomb*
Cute Li'l UFO - ???
Crested Booka - Chick
Desert Coil Snake - Chick
Scalding Coffee - Cup of Coffee
Extra Cranky Lady - Handbag Strap
Shattered Man(Summers) - Mummy Wrap
Kraken - Gutsy Bat#
Beautiful UFO - ???
Pitbull Slug - Packet of Salt*
Master Barf - Casey Bat!
Atomic Powered Robot - Super Bomb
Starman Super - Sword of Kings#
Chomposaur - Magic Frypan#*
Uncontrolable Sphere - Broken Antenna#
Major Psychic Psycho - Star Pennandt#*
Ghost of Starman - Goddess Ribbon#, Multi Bottle Rocket
Squatter Deamon - Vial of Serum*
Here's another list of stuff! Thanks to Light for the info!
Tangoo - Snake
Plain Crocodile - Meteorium#
Great Crested Booka - Beef Jerky
Struttin' Evil Mushroom - Cookie
Skelpion - Picnic Lunch
Mole Playing Rough - Crossiant
High Class UFO - Can of fruit juice, Skip Sandwich DX
Bad Buffalo - Wet towel
Gigantic Ant - Double Burger
Well that's all I know for now.