Added game systems and objectives to GDD

SpinnerGDD.md

@@ -85,13 +85,33 @@ The loop of levels will be to:
 3. Combine them together to create a new challenge
 4. Repeat
 
+### **3.2 Objectives and Progression**
+
+In each run the player will progress through the levels one by one and able to progress as much as they are able to.
+Completing levels will grant the player score and introduce them to new enemies, power ups and mechanics.
+
+Upon beating the level the player will gain currency relative to their player score.
+This currency will be stored over between different runs and allow the player to upgrade different aspects of their kit.
+Doing this will make it easier for the player to gain a new high score and hopefully make it easier for them to enjoy the game.
+
 ### **3.3 Game systems**
 
-- **Powerups**
-Portals - to achieve the appearance of non-Euclidean Changing gravity direction - used in some of the puzzles Trains - start/end of levels as well as being travel between levels (interacted by player) Ticket barriers - act as one way barriers in levels (interacted by player)
-`
+- ##### Level flow
 
-- **Enemies**
+All objects will be orbiting a black hole in the centre of the screen whilst slowly being sucked in.
+The players only input will be to increase the distance between them and the black hole.
+However in every other level the black hole will be replaced by a white hole pushing all objects away
+and the players movement will be inverted making them only able to increase the distance between them and the white hole.
 
-- **Level flow**
+- ##### Enemies
 
+Small objects will spawn with the level that are also affected by the 'Level flow' these will cause the player to die on collison with them. 
+They will be moving at a different speed to the player so they have to dodge them.
+As the player enters higher and higher levels the enemies will become harder to dodge by increasing in size and spawning projectiles.
+
+- ##### Powerups
+
+Powerups will occasionally spawn throught levels, they will all have the same appearance but have randomised effects.
+Most of these effects will benefit the player such as: short time inverability, gain X points or slowdown enemies.
+However a small percentage of these will make the players time harder such as: increasing the player size or speed up the player.
+By making it so not all powerups are a benefit the player will be taking a risk by picking them up hopefully increasing their enjoyment.