Version 0.5.2.1

Changes:

• Fixed a bug with chunky tank tier 3 enemy where they wouldn't correctly target the player base in Level 1.
• Added credits and a proper ending to level 2.
• Sell and buy button in the shop and reworked fuel system.
• General balancing and QoL changes.

New fuel system automatically calculates the fuel cost in the shop after buying the towers this way the managing of said system is easier and more logical. But as always more feedback is appreciated!