Fallen Empire is a tower defense game set in a fantasy world. Build towers near the path to attack evil creatures that travel on the ground or in the air. Towers can be upgraded, or converted from one type of tower to another. Don't let too many enemies reach the end of the path!
Controls

1, 2, 3, 4, 5, 6, 7 - set appropriate tower.
Up, W, mouse wheel - scroll map up.
Down, S, mouse wheel - scroll map down.
Q - convert tower.
E - update tower.
A - cancel sell/convert/update/build tower.
D - sell tower.