Patterns of Asteroids to Appear in Levels

I began watching a playthrough of "Epistory" to get a better idea of the kind of Types of obstacles that could appear in game -

Obstacle 1 : Moons - Stationary asteroids that aren't moving at all could be called "Moons." Their design could be spherical and uniform. Moons are the main obstacle at lower levels when players are getting familiar with the game.

Subcategories of Moons -

1. "Moon : Vulcanian" - Hot, firey moons. When the player decides to kill them they blow up and destroy all other enemies on screen at that moment. They act as a resource players must choose to use wisely.
2. "Moon : Cryogenic" - Icy moons which freeze all obstacles on screen for a certain amount of time.
3. "Moon : Terrestrial" - Normal static moons which are destroyed for points. In game for lore, the reason they may need to be destroyed is to allow the player build a space station of some sort. At later levels on planets that have life on it maybe players shouldn't destroy such moons as it would affect waves, etc. Choosing to preserve such a moon by not senselessly destroying every object to appear on screen could help players think before they type. If any kind of base building mechanic is implemented later on - where players can set up stations on certain planets to farm in game currencies that they can earn passively having a good relationship with the creatures of that planet by not destroying an essential moon could allow them to set up a base on such planets.

Obstacle 2 : Asteroids - The main obstacles in the game that move towards the player.