Grid Forge TD - Update 1

Onboarding changes:

• Now you start with 10 gold, and the ability to place towers
• Tetronimo stacking: Now starts at level 0 so there's one less new thing to get across. 

New upgrades

• Critical hits: upgrades now exist for you to unlock critical hit
• Tired enemies: The more tiles an enemy has travelled the more damage they take.
• Tetronimo stacking: Added another tier of tetronimo stacking upgrades so you can still get to the same level as before.
• Map width: You can now upgrade columns further.

Let me know if there are any upgrades you'd like to see!