Growing Feature Set

Implemented multiple things since last time.

- blink upgrades, including blink cooldown, speed/distance increases, and a fire blink that leaves behind 3 "fire waves" that do damage. Their damage can be upgraded by upgrading fireblink.

- added hearts that drop at different rates from different mobs that heal 10 hp each (idk if this is the best way to restore health but I wanted to give it a try)

- added max health upgrades to store

- adjusted store prices, as gun2 on max upgrade is way too powerful atm

- two new enemies:

       - wizard that does either a more powerful, longer range single shot attack towards the player, or an 8 way attack that has shorter range and does a little less damage

        - a samurai guy that does two swings for a lot of damage (or will cancel after one swing if the player walks too far away)

- Tried implementing another level above ground level, but enemies get stuck and it isnt all working properly. Alot more to do on that front and with the enemy AI