Tower upgrade path Concept
A - Basic Tower, average attack speed, damage and range. Only tower available to be placed by player at any point in the game.
A2 - Upgrade of A, still average, just with higher stats.
A3 - 200% Damage
OR
A4 - Upgrades Attack Speed by 50% and Range by 33%.
B - A long range, fast attacking tower with low damage, upgraded from A. B2 - 200% Damage
OR
B3 - Upgrade Range by 33% and Attack Speed by 66%
C - A short range, slow attacking tower with AOE damage, upgraded from A.
C2 - 200% Damage
OR
C3 - 300% Range
A2 - Upgrade of A, still average, just with higher stats.
A3 - 200% Damage
OR
A4 - Upgrades Attack Speed by 50% and Range by 33%.
B - A long range, fast attacking tower with low damage, upgraded from A. B2 - 200% Damage
OR
B3 - Upgrade Range by 33% and Attack Speed by 66%
C - A short range, slow attacking tower with AOE damage, upgraded from A.
C2 - 200% Damage
OR
C3 - 300% Range