Undead Invasion is a 2D shooter game where you have to survive against zombies. You are a survivor of a zombie apocalypse in this game. You have to battle against waves of zombies that get stronger and more numerous. You have to protect your "base" from the undead in a destroyed environment, like an orphanage or an abandoned building.
There are aspects of shooting, defensive, tower defense, and roguelike games in this one. This implies that every time you play again, you'll have a varied experience with different weapons, traps, zombie waves, and so on.

Kill zombies with guns and melee weapons.
Put up barricades, traps, and other things that will slow down or stop zombies.
Take care of your resources, kill zombies to gain "money" in the game, and then use that money to buy and improve weapons, traps, support supplies, and other things to get ready for the next attack.
If your character dies, you have to start over, which is quite important. There are no checkpoints in the game.
Zombies come in waves, and each wave is worse than the last. As the game goes on, there are more and more zombies of different types, and you have to shoot, set traps, and plan ahead to stay alive.
You need to be quick and think ahead to play the game. You can't just shoot; you have to figure out when to set traps, use melee or ranged weapons, switch weapons, and so on.
This game stays fun and tough for a long time because of the "roguelike and random weapon, zombie, and trap" features that make each repeat new.
Other great games you can try: Master Archer, Wheelie Party
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