Here's a list of suggestions for the mod. Which of these coding changes would you like to see in this mod? Or maybe I forgot something? Here's the place to discuss the coding ideas.
Here's the list with some suggestions made by me or others:
One locked door and key
25-35 levels
200% ammo
110% health
Teleporters
Directional sprites
Pushable objects
Breakable objects
Bestweapon tutorial
Ambient sounds
Wall patches
Enemies pick up bonus items
Level name when start up game
In-game messages
Adding shadows to characters (when in-game messages are enabled)
Split Hitler into two bosses
Animated objects
Animated walls
Interactive objects
Pushwalls activated by switches
Locked doors locked by switches
Civilians
Gun bobbing
Blood splatters
Automap
Add Text Messages to Menu Select Screens
Spawnpoints (for enemies, walls, objects etc.)
New weapons
Level ending object
Ammo walls
Health walls
Weapon change bob
Reloading weapons
Different ammo types
Flame walls
defusable bombs
Add 25 ammo box
Intermission screens
Backpack
Landmines
Doors open from center (Blake Stone style doors)
Bosses react to sounds
Crosshair
Death artifact
Timed bonus artifacts
Bonus time display
Floor that hurts player
Enemy uniform/invisibility
Doors don't close automatically
Enemies open up pushwalls
Treasure chest
Fullscreen
Adding non-grid collision detection to pushwalls
Remove par-times
Transparent ceilings
Portable items (medkits etc.)
Different door sides
One stab in the back kills
Alternative paths
Animated floors/ceilings
Armour
Another start position (when you die in-game, you start from another position)
Berserk mode
Suicide bombers
Make guard spawn other guards
More difficulty levels (for challenges or just to make it even more difficult!)
Timed levels
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Not all of them are needed, ofcourse.