Vertical slice advice

I was going through some old e-mails and I came across this bit of advice for a developer. Maybe one of you game developers will find it helpful...

IMHO, What should be in a vertical slice design-wise:

 

• Camera view should be locked in, code-controlled camera movement should be in, player controlled camera controls should be usable
• Player controls should be locked in and mapped to player functions
• Player character model should be in and all animations required to support movement, combat, damage, death, idle and support moves should be in
• Player distance metrics (walk/run speed, jump height, projectile distance, etc.) should be locked down and operational
• The level should be navigatible from beginning to end and loading (sections) should work without popping or slow down
• World collision detection system should be functioning without error, fall-through cracks, etc.
• Any appropriate game navigation play mechanics (moving platforms, opening doors, etc.) should be in and functioning with appropriate accompanying player operation animations
• Checkpoint system should be in and working
• Level should be populated with enemies in regards to how they create the combat experience
• Enemy logic, pathing system and AI should be in place, creating a representative combat experience
• Enemies should have all associated movement, combat, reaction, death and idle animations
• Enemy health system should be in and operating
• All attacks (player and enemy) requiring projectiles and VFX (shockwaves, fire, cold VFX, etc.) should be in
• Combat should represent the final experience in the game (feel, controls, damage system, animation, collision, effects, camera effects)
• Player health system and HUD elements should be displayed and working
• Representative level mechanics and hazards should be in – collision and damage effects should be functional
• HUD should be in place and performing functions they are assigned to (score increase with kills, etc.)
• Any inventory system should be working, additional screens supporting inventory and navigation should be in
• Any progression system (experience, perks, etc.) should be functioning with representative HUD and in-game elements in
• Any scoring system should be functioning with representative HUD and in-game elements in
• Any pickups (health, ammo, etc.) should be in the game and performing their functions. Preferably with associated special effects)
• Economy system (if applicable) should be in place with associated pickups (coins, etc.)
• Any unusual game play and player movement functionality should be represented (mini-game, zip-line, flying, underwater, etc.) with associated controls, camera, animations, etc.
• Temporary sound effects should be in
• Temporary music track should be in
• Place holder cutscenes/animatics should be in