Stats

Cash upgrade
Walk speed (Max 75): help you move faster

Health regen (Max 100): help you heal faster, increase your regen speed (health/sec)

Max health (Max inf): increase your max hp

Damage bonus (Max 100): increase your damage

Repair castle: heal the castle (250hp/250$)

Tix upgrade
Critical damage (Max 100): increase your critical damage multipler

Critical hit chance (Max 100%): increase your critical chance