Sounds sourced below:
From SoundImage.org
Music by Eric Matyas
MORNING DOCTOR WEIRD: background loop
SYNTH CHIME 7: power-up sound
From freeSound.org
LloydEvans09
jump1.wav : player jump sound
ProjectsU012
8-bit "failure" sound: player lost life sound
Motion_S
Squeak FX.wav: gun sound
spookymodem
Goblin Death.wav: enemy death sound
LittleRobotSoundFactory
Jingle_Win_01.wav: win-screen jingle