Arcade games best score?

What is you best score in this arcade games? And why, "simple" arcade games are so damm hard?

Gallery

Ahh i forgot about links!

https://play.google.com/store/apps/details?id=com.msk.eggmergency

https://play.google.com/store/apps/details?id=com.jakyl.hardlineshd

https://play.google.com/store/apps/details?id=neo.group.fappybird