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About Let Them Come: Onslaught
Let Them Come: Onslaught delivers a relentless roguelike alien assault with fast‑paced bullet‑hell combat and a retro 80s sci‑fi vibe. Players craft builds from a chaotic arsenal, upgrade weapons, and survive wave after wave of enemies across ever‑changing worlds.
The game features two playable characters, four distinct environments, and towering boss encounters, all set to an original synth‑wave soundtrack. Full controller, keyboard‑only, and mouse‑only options let you choose your preferred input method while Steam Cloud saves keep progress safe.
01 / THE GUIDE
Over‑the‑Top Weapon Arsenal
The game offers multiple weapons, from flamethrowers to Photon Sabers, each delivering a unique playstyle. Upgrades let you stack effects, creating combos that can clear crowds or focus precision fire.
Weapon choice shapes your build, letting you prioritize crowd‑clearing firepower, pinpoint accuracy, or defensive shields. The variety encourages experimentation to find the most satisfying and effective loadout.
- Try pairing a high‑damage weapon with a shield upgrade for survivability.
- Mix crowd‑clearing and precision weapons to handle varied enemy groups.
02 / THE GUIDE
Deep Roguelite Progression
Each run grants hard‑earned rewards that can be invested to unlock new skills and enhance existing ones. Build crafting between battles lets you refine strategies and push deeper into enemy territory.
The procedural nature ensures no two runs are identical, making experimentation with weapon synergies a core part of progression.
- Focus on unlocking upgrades that complement your preferred weapon style.
- Use each run to test a new combination before committing resources.

03 / THE GUIDE
Wave Survival and Boss Battles
Alien waves intensify, testing reflexes and tactics. Surviving long enough triggers towering boss encounters that demand full mastery of your build and timing.
Boss fights serve as climactic tests, rewarding players who have honed their loadout and learned enemy patterns throughout the run.
- Observe boss attack cues early to adjust your positioning.
- Reserve high‑damage upgrades for the final boss phase.
04 / THE GUIDE
Four Distinct Worlds and Dynamic Maps
Players battle through four unique environments whose maps change each run. Dynamic elements like surprise mini‑bosses, distant supply drops, and random missions add variety.
These procedural maps keep each session fresh, requiring adaptation to new layouts and unexpected events.
- Keep an eye on distant supply drops for extra loot.
- Adapt your route when random missions appear to maximize rewards.
05 / THE GUIDE
Audio, Input Options, and Cloud Saves
An original synth‑wave soundtrack by Cartridge 87 drives the retro atmosphere. The game supports full controller, DualShock, DualSense, keyboard‑only, and mouse‑only inputs, letting players choose their preferred method.
Steam Cloud integration ensures progress is saved across sessions, and Steam Achievements provide extra goals.
- Experiment with controller vs. mouse for aiming comfort.
- Enable Steam Cloud to keep your builds safe across installations.





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