"Click the window to start, then click the mouse button or tap the space bar to flap your wings. If you hold the button down, you will dive.
tap - flap wings
hold - dive
none - soar
collide - perch
To reverse direction, perch on a pillar by flying into it. When you lift off again, you will be flying in the opposite direction.
Every ten seconds, a new swarmer appears. It's quite a sight when you have a hundred of them on the screen at a time.
You can reload the page to get a new environment to play in." - You could use two switches with one set for rapid-fire using JoyToKey for those unable to tap a switch rapidly.
Via: Active Sketch 04 - Pillars by ~axcho on deviantART