To restart: right click the game and select 'settings' to bring up Flash Player settings. Select Local Storage [icon with the folder and green arrow] and slide the bar to the left. Refresh and enjoy.
Simple yet extremely addictive gameplay AND frequent replies to feedback coupled with respective adjustments to the game? No wonder this game is getting such good ratings, good job TFC!
If Rebuild had a minigame for when the stronghold was under attack, this is what I'd expect it to look a little bit like. It does get too easy in the later stages though - by level 12 I wasn't even firing my own shots as my MGs were effective enough, the introduction of more powerful zombies having minimal impact, and I hadn't even made a single use of the artillery. Ramp up the difficulty, fix the typos, add a few more upgrades [everyone on Kongregate loves upgrades] and it'll become a lot more engaging.