The blue bar is your stamina, it is drained when you fly upward, replenished while on the ground or by collecting treats.
The green bar is your 'health' (if you call it that, don't worry you don't die) everytime you hit a bird this decreases, when empty it's Game Over!
There are a total of 6 upgrades to purchase, and 35 achievements to earn.
Interactive Buddy
8.8
Cake Decoration
8.7
Papa Louie: When Pizzas Attack
9.3
Sue's Cooking Game
8.3
Tiny Tina's Ice Cream Sundae Rush
8.4
Papa Louie 2: When Burgers Attack
9.1
Papa's Pastaria
9.4
Papa’s Bakeria
9.4
Orion Sandbox Enhanced
9.5Short and Sweet
7.4
Papa's Scooperia
9.4
Tube Clicker
8.9
Star Stable
7.1
Unicorn!
6.9
Little Pony First Aid
8.5
Horse Racing
7.8
MadMad Unicorn
5.9
Stallion's Spirit
7.6
Horse Racing 3D
8.0
Happy Pony
9.6
Cute Unicorn Care
9.0
Rainbow Pony Caring
8.4
Cute Pony Care
8.7
Horse Family Animal Simulator 3D
9.1
Jumping Horse 3D
7.6
Lemon Drop as: Fat Fat Horse
7.4
Horse Rider
7.8
Pony Pet Salon
8.2
Stallion Spirit Gladiators Fury
8.4
Horseman
8.4