- Longer game.
- No Doom3 looks-all-the-same-everywhere levels. Everyone hates it!
- One or two more weapons.
- More use of the whole spirit concept. More advanced puzzles. Perhaps some part of the game where you are in spirit form all the time.
- Changes to the spirit mode during the game. Somehow grow more powerful over the game.
- Keep the comments from Tommy! I havn't heard such since Duke3d!