Need to Modify An Android Game

Note: Please bid seriously and after reading the complete description. because i have limited budget right now. and your quoted amount will be considered final for the work. So if interested, bid serious and final amount. One more thing, you must use Unity3d 5.5.0f3 only for this work. You need to change the movement of the player bird in the attached game. Please keep “Subway Surfer” in mind when you read below instructions, then you may understand what I am trying to ask you to make; The bird must keep moving in this 2d game, just like the player keep moving in the Subway Surfer (an endless running) game. The environment must keep moving as it was, in opposite direction to the player bird but with following conditions; 1. If game continuous more than 60 sec, the speed of the game must increase by 15% (1 x 1.15 = 1.15). 2. If game continuous more than 60 sec but less than 90 sec, the last speed of the game must increase by 21.74% (1.15 x 1.2174 = 1.40). 3. If game continuous more than 90 sec but less than 110 sec, the last speed of the game must increase by 21.43% (1.40 x 1.2143 = 1.70). 4. If game continuous more than 110 sec but less than 150 sec, the last speed of the game must increase by 17.65% (1.70 x 1.1765 = 2.0). 5. If game continuous more than 150 sec and so on, the last speed of the game must increase by 12.5% (2.0 x 1.125 = 2.25). 6. If the game continuous with using the “Revive” option, then the game must get continued with environment’s speed of 1.0. There will be some enemy birds, which will be randomly generated through prefab. These enemy birds will fly in opposite direction, just like the environment which move towards the player (in opposite direction). Game will be over if the player bird collides with them. There will be tranches of trees and rocks in the air which move in opposite direction, towards the player bird to end it’s game when collided with it. There must be some coins, generated randomly in the way of the player bird, when the bird collide with them, they will get destroyed and increase the score of the player bird.