We need to fine tune the laser beam to spawn at a more suitable location on the ship model, and we also need to destroy it once it's offscreen.

The spaceship is currently part of the hierarchy at the game's beginning. We set it up so it's instantiated from a prefab at game start and after player death.

We add a simple firing sound effect to every laser beam fired by playing a cached audio clip.

We'll set up the system for detecting when the asteroids are all gone and incrementing the levels accordingly. We'll also trigger and fine tune the asteroid spawning script.

We'll set up the framework for creating a GUI for your asteroids game that gets information from all the variables you want to display onscreen, including remaining lives, score, and remaining enemies.

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We'll set up the remaining lives GUI by creating a plane with a heart texture, detecting the camera's viewport, and creating a way to consistently place the plane within the viewport.

We position the lives counter plane objects based on current player lives, giving an accurate readout for the player.

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We'll set up the “score” and “remaining enemies” GUI by using 3D Text Meshes and a similar positioning technique as the “remaining lives” GUI.

We tie in the “score” and “remaining enemies” GUI to the actual values in our game, giving the player an interactive GUI readout of their game performance.