You are circle at all, control your side, circle means you are (mostly) safe.
- PGUP: Decrease circle radius.
- PGDWN: Increase circle radius.
- Mouse Movement: Stop circle drawing.
- Do not Move Mouse: Start drawing circle.
- ESC: exit / stop
- INS to start. DEL to stop.
- Align the movement with arrow keys ⬆⬇⬅➡