Gameplay Mock-Up Made [OUTDATED]

I've made the resources necessary for the ball, Humino, go through. Let's go over the details:

The UFO will be spawn in 1:30 minutes hovering below the score UI and leaves after 15 seconds. Once hit, it'll give the player invincibility for  15 seconds. After that, the time reset on UFO. (1,600 points)

The helicopter will be spawn in 30 seconds and be hovering to the right. Once hit, it'll give the player a shield above the skyscrapers given, and it'll take 9 hits to break the shield. After that, the time reset on the helicopter and the hovering direction will be switch. (1, 200 points)

The cloud will be spawn at 2:00 minutes and be hovering to the left. Once hit, it'll give the player two extra balls; hit again while at max capacity, and nothing happens; with one ball loss, however, another ball is added. After that, the time reset on the cloud. (8,00 points)

The five balls above the background will fall down one by one per 8 seconds by default; will decrease down to 2 seconds at max. 

Here are the default of the mechanics when starting the game:

Stage: 1 (MAX: 100) → Will Be Taken Back to Stage 1

Lives: 5 (MAX: 9)

Target: 10 + 2 (MAX: 210) → Will Be Reset Back to 10 Balls After Stage 100

I'm now making the scripts to make all of these sources work, since I'm working on an arcade game with Unity.