Here's what I think
The sprite you have are nice. Should the ? blocks disappear after I hit them, because that was pretty odd to me. I also think he accelerates and jumps up too fast for me. I also had a bug once where I jumped and ended up crashing through all the blocks under me.
Curious on where you'll go with this, but with the dying thing, I think there's some actionscript code where when some event happens, it'll go to a certain frame. I don't remember what it's called though. That code should help with your dying bug.