now at the start of each match. high power towers will be locked. canon, air strike, air defense, healing turret and mini gun. to gain access to these towers you'll need to upgrade your town.
once you max out your 4 upgrades you'll have the opportunity to convert your town to a keep. this adds income, unlocks healing towers and visually shows the change in the town. now you'll want to do this at the right time. town upgrades take time to build not long but other players can see when your up to something.
once you have a keep you can choose 1 of 4 specializations. bank -max out income potential, bomb factory - unlock canons, air strip - unlocks air strikes and air defense, gear factory - unlocks mini gun. build times may be adjusted later for now simply testing but the impact is noticeable. feels like the right direction.