Scratch

You are a dragon and  ghosts come flying toward you and you have to shoot them.
Keep going until you get hit by a ghost.

DRAGON vs GHOSTS
http://scratch.mit.edu/projects/winkleink/2847788

A simple single level game.

Set background to Starfield

Dragon
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Dragon is set to mouse Y position
If Dragon is hit by Ghost - Game Over

Bullet
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When mouse down bullet starts at dragon's mouth
Play sound
move +10
Hide if touching Ghost
Hide if touching edge
Hide if Game Over

Ghost
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Each Ghost waits from 1 to 5 seconds before appearing (again) at a random position from on the left of the screen
Hide if touching edge
Hide is touching bullet, increase Score by 1 and play sound

Created 1 Ghost first, sorted out all the above and then just duplicated the ghost 6 times to give 7 ghosts all doing the same thing.

Overtime as the ghosts get shot and they wait a random time from 1 to 5 seconds the 'waves' get tougher to avoid.

Nothing fancy but hopefully fun.