The running upgrade is the worst. The health pretty much increases how far you get, the ability to roll i have used many times, and the multiple jumping is undoubtedly the best. Multiple jumping is a powerful upgrade in nearly all games and this is no exception.
If i get a coin to quickly then i often get killed while waiting for the next coin. It would be an improvement if the next coin appeared right after the first is collected, and one at a time like dots.
 "DuckLife2: World Champion"){kind=icon}
 "Raze 2"){kind=icon}
 "Sticky Ninja Academy"){kind=icon}
 "Survival Lab"){kind=icon}