Post-Trijam update 1 (build 6)

Changes in this version:

• balance: quad damage instead of triple damage
• better positional randomization of coin spawns
• super basic touch screen support
• enemy spawn circle: always leave a fixed “segment” free, so player has a better chance to slip out
• zone radius color matches zone type
• bugfix: some enemies were not flipped correctly while moving
• slightly bigger line of sight cone for the player
• some code cleanup / refactoring and optimizations