wasd to move. survive for 100 seconds to beat the apple. this is a gimmick. the intro is about 20 seconds long so just be patient. every thirty seconds, the projectiles get faster, and his stamina goes down every second. once his stamina is depleted, you win.
The song is ASGORE from UNDERTALE. This is probably my best project ever so please Heart and Star. please follow me. also good job, you found the secret. press the green flag, then press L.