Minor Update_2021.03.16

1. Added suicide function. -When you fall after being hit by an obstacle in some areas, you may have too long flight time. Therefore, a suicide function has been added so that you can choose a quick death.

Note) The suicide function is conditional when floating in the air, but the condition is also established during Normal jumps. We tried to impose a number of restrictions, but we decided to leave it to the users' freedom to press the suicide key. Be careful not to accidentally press them during the game!