Press W to go up. Press A to go left. Press D to go right. Watch the flight meter, as once it gets to zero, you will fall. When you touch the ground, it will replenish.
There is a high score system. If you beat the current top score, you will have your score remembered as the highest. If you find a bug, PLEASE don't use it to set a new high score. If I find an unreasonably high score (~100) , I will not hesitate to remove it. Have fun. ;-)