TDFren's Tower Defense Game

Prevented path from getting completely blocked

Build error messages inform user of the rules

Foundations can be built on water/sand that allow structures to be built over them

Implemented game settings that saves/loads data from userprefs

Implemented system that spawns appropriate particle effect type at a given location when area of effect ability is used

+ Implemented status effects
+ Added frost and poison towers
+ Tooltip displays information about projectile effects