The interviewee provided their perspectives on including unlockable avatars, game genre preferences, and difficulty levels in games. Specifically:
1. They agreed unlockable avatars give players a more rewarding experience and replayability by working towards new avatars.
2. While preferring freedom of movement in all directions, they noted side scrollers can still work if unique in art/story.
3. Multiple difficulty levels were recommended over just one, to provide challenges for replayability, and rewards should be offered for higher difficulties.