- Balls flicker, alternating between visible and invisible
- Levels last 30(?) seconds
- Ball spawning rate increases with each level
- When you die you lose 25,000(?) points but restart at the current level
- When you die but don't have enough points to lose, the game is over
- 2 players (possibly more)
- Players shoot at each other instead of avoiding computer-spawned balls
- The last player left wins
- Give an option to play against an AI?
- Get coins from winning games (based on score)
- Add additional characters that can be purchased with coins
- Add a character select screen to choose between characters
- Achievements (unlock characters or give coins on completion)
- Online leaderboard to compare highscores with other players