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It's useful to have a stock of ideas for quickly adding or replacing mechanics.
- Enemy - 4, "Pixel", appearance like the enemy in space invaders. Could be an Easter egg for reaching 999,999 points.
- Leaderboard, you can save points on the server and display the leaderboard.
- Changing the background and colors of enemies over time will diversify the visuals.
- Boss battles will break the endless gameplay into segments and give a clear sense of progress.