Here is the game as it was before I scrapped it. The video shows the menu UI slide-down with an animation. For this, I created a title in Photoshop using a premade template, adding my text and experimenting with the colour. I animated this in unity, adding the house as a child object. This had its animation so it slid to the right position. I added some UI for my name and BlackThornProds name to credit the assets. I animated this to slide up in time with the title.

For the trees I created an object and added a script, the script will get a set of prefabs and randomly add them to a set of spawn points. The script used a random range of random prefabs using the Unity Engine. Random. Range. It would then ensure that the point did not already have a tree object at its position. After I did all this, I attempted to switch the project to a tile system. So I used the random generator and followed the prefabs using the tiles. 

There is a script that sets several predetermined minions that the player can spawn. The idea for the game was that each time the player placed a building, the number of minions would rise. I did not manage to implement this feature, but I got the placement working. The script would detect the players' mouse click, then would count the number of spawned minions up. If the number of minions was too high, the spawn code would not be called.