First patch update - Still extreamly early WIP

Started work on an upgrade system and added in a new currency to be specifically used for upgrades, currently only upgrade is additional action slots.
Starting action slots have been reduced to 2 but can be upgraded to 4

added in a "Boss" enemy that spawns in at the end of a round and the round completion is now triggered by killing that boss.

reduced round time to 1 min temporarily, will increase this later or start adding in options for round "Maps" and times.

added the ability to save earnt currency and upgrades that are bought from the main menu.

have found a bug where the health bar will sometimes resize itself and look depleted - to investigate later