Here is a long list of features that should be removed/not be part of stable 0.5.0 release:
Badguys:
Angry stone
Fluffly - already removed, use Snowball instead
Ghost tree
Kugelblitz - use Jumpy instead
Mole
Mr Rocket - already removed, use Kamikaze Snowball instead
Nolok - code already removed, use Yeti instead
Plant
Spider mite - use Flying Snowball instead
Totem
Levels:
All test levels
Incubator Island
Intro cutscene from Picnic with Penny along with speech and Penny and Nolok images
The Forest World and the passage leading to it (graphics, badguys, objects and tiles will be kept)
Powerups:
Ice flower (only remove ability to get it, graphics and code will be kept) - use Fire flower instead
Objects:
Hatch - already removed, use Door instead
Keys
Rusty Trampoline - use Trampoline instead
Skull tile (code and sprite only, graphics will be kept) - use Unstable Tile instead
Tiles:
Ghostforest tiles
Misc features:
Swimming - already disabled
Misc cleanups:
Castledoor images and sprites
Cherrybomb and Juicebox images and sprites
Dummyguy images and sprite
eat-me sprite
Old worldmap Fire Tux image
Flame fish images and sprite
firefly-7 file
Payphone Info Block image - already removed
gwater's nolok statue image (i mean the forest one)
kracker images and sprites
Milestone 2 image
Pink bell images and sprite
Test Tux animation - already removed
Tumbleweed images
Worldmap castle and casle door images
Unused music (bonuscave, darkforestkeep, fortress2, gameover_castle, gameover_forest, gameover_ghostforest, ghostforest, ghostforest2, leveldone-special, nolok, treeboss, wisphunt)
Unused worldmap images
This is an awful lot and i think we should remove all the never used junk in order to reduce the size of the distributive.
P.S. Don't worry, some of these features will be added back in 0.6.0 release as soon as they are completed and polished up.