Great! But a bug

Lol.. Great game, but when I defeated the alien, I wandered all the way to the right and fell out of the screen and died after the lifes were calculated and deducted.

Then when mario came, I got stuck, because no life left to spawn.

>.<

One suggestion

I noticed that the sprites or background seem to stick even after letting go of the mouse sometimes.

I guess you used the "on(release)" method to let go.
You need to add another "on(releaseOutside)" with the same content as the code you use for the on(release).

This way, even if they let go of the mouse button outside the sprite or background, the mouse would be free of any sticky things.

:P

Anyway, good job! Thats a lot of sprites!! (Hard work)

Great song for battles!

Used the track for a boss battle in one of my games.
The drum beat is a bit too long tho.. :P

Catchy tune!!

This song is great! Its so catchy I had to hunt for it just to make sure it appears in my latest game. :) Thanks!!

This is going into the battle scenes!