Undead Invasion

Undead Invasion: Daylight Bookkeeping, Nightfall Siege

A roguelike survival shooter built around a two-phase loop. Undead Invasion sends a wave of the walking dead at the crumbling orphanage you are holding every sunset; each sunrise gives you a few quiet minutes to spend whatever you earned and rebuild what the last assault tore down.

The Loop

Nights in Undead Invasion are pure defence. The enemy roster escalates past basic shamblers into faster elite types that punish a static setup, so the wave you barely survived on day three will walk straight through whatever you built for day three. Days are where runs are actually decided: every kill pays cash, and the shop trades that cash for weapon upgrades, explosives, and additional barricades. The upgrade you skip early is usually the reason day eight ends badly.

Fences and barricades do more than soak damage — placed well, they funnel the horde into a single corridor, and a corridor is what turns one well-placed mine into most of a wave. Reading the map and choosing the chokepoint matters more than raw aim.

Combat Details

Two habits separate survivors from corpses. The kick on the space bar buys breathing room when something closes the gap, and it is free — use it constantly rather than saving it. And reloading on R takes long enough that doing it mid-surge will get you killed; reload during the gaps between spawns instead. When ammunition is tight, the knife handles singles quietly and lets you bank rounds for the heavy waves.

Long runs reward balance over firepower. Movement speed and structural resilience keep paying off on night twelve, whereas another damage upgrade only helps until something catches you from behind.

Setting and Structure

The orphanage in Undead Invasion is not interchangeable scenery. Notes, rooms and discarded details across the map piece together what happened here before the outbreak, and a low mix of distant moans and weapon handling keeps the isolation intact between waves. Because runs are roguelike, a failed defence still teaches you the wave order and which build paths survive — and Playground Mode gives you a consequence-free sandbox to test traps and weapons before committing to a real run.

Playing Here

It runs in the frame above for free with no download, but Undead Invasion does need a connection, since progress is stored server-side rather than locally. Sessions are short enough to fit a break, and restarting costs nothing. Load up on Fun Clicker, spend your first daylight wisely, and see how many nights you can hold.