I would never understand why people create several fancy start screens and add 40+ megabytes of music and animations, before coding basic game mechanics. Doesn't it annoy you when you have to listen to the same music and go through the same screens hundreds of times every day?
You could have at least removed all that unrelated stuff before posting it here, as a courtesy to those who are willing to help you.
1. You are spawning targetspr in event #27 on every tick while 3 conditions are met. If you just want to spawn this sprite once, you can add another condition:
targetspr.count=0
2. Not sure which sound you are talking about. When I press Z, the "jump" sound is played immediately.