I might have to reinstall the game.

One: Which files do I have to keep so that my progress in the game is not lost ?

Two: My game crashes at the end of level 4 and I can't go past that. Can someone post a file with progress made up to level 5 or more so that I can go on with the game ?

thanks,
Shadi

for anyone that might need help with this.

the save files are found in this location
Shadowgrounds\Profiles\Default\Save

You can download save files from the developer here
http://shadowgroundsgame.com/savegames/