Not bad
This is a great learning experiment, theirs just a few things you need to clear up if you missed them.
1- Check your "Fall" hit box that sets the "Died" variable jumping off the left side results in an infinite fall.
2- spend more time on level design, you seem to have enemies completed and coins as well, just make your level longer.
3- when you fall into a pit and die, the vertical movement isn't reset to 0 when you respawn causing you to fall through the ground.
Hope this helps