Sentinel

Sentinel is a tower-defense action game developed for the "Linux Deutschland Game Jam." Every year on Halloween, your village is attacked by hordes of undead, and as a powerful mage stationed on a tower, it is up to you to fend off the attackers and protect the village.

Use powerful spells and strategically place archers along the enemies' path to stop the hordes. Defeated enemies drop gold, which you can use to buy upgrades and recruit new defenders. With each wave, the challenge increases, as enemies receive random bonuses.