You start with a level 1 castle. There are 9 upgrades. With every upgrade, you collect gems faster and faster. To battle, you must buy knights with the gems you collect. To win, you need to have more knights than the enemy.
I spent about 14 hours straight on this project. This is by far the biggest project I've ever done so far. I would expand it, but it gets annoying messing with all those crazy scripts. Hope you enjoy!