3H (Must have, should have, could have)

Must Have

1. Interaction System
2. Movement Mechanics
3. Time Countdown Mechanics
4. Defeat Mechanics
5. Win Mechanics
6. Item Mechanics
7. Character

Should Have

1. Obstacle Mechanics
2. Dialogue System
3. Teleport/Change Location Features
4. Character Portrait
5. Cut Scene Mechanics
6. Key Item features
7. User Interface
8. Different Endings Features

Could Have

1. Music