Beacon Keep

Keep a lighthouse burning on a rocky island while sea monsters crawl in from the dark – and remember that your towers can only shoot what the lamp's turning beam lights up.

How to play

Each night the lamp turns on its own, and jellyfish, rock crabs, flying fish and a giant deep-sea beast close in from every side. Hold left or right to swing the beam faster (it burns oil) so your towers can see their targets. Between nights, spend the gold you earn on new towers and permanent lamp upgrades, then take on a harder night.

Features

• Light is sight: monsters outside the beam are only faint shadows, and towers will not fire at them
• 3 tower types on 8 stone slots: the Crossbow, the Cannon with splash damage, and the Mirror that reflects a second beam
• Upgrade every tower up to level 5
• 4 permanent lamp upgrades: range, beam width, turn speed and oil
• 20 hand-tuned nights with a deep-sea boss that dives out of the light on nights 10 and 20, then an endless mode that keeps getting harder
• Losing never takes your upgrades away: retry the night with everything you have built
• Gold keeps trickling in while you are away (up to 4 hours)
• One-handed portrait play, sessions of a few minutes
• Available in 10 languages
• No ads

Controls

• Desktop: hold the left or right half of the screen with the mouse, or hold ← / A (counter-clockwise) and → / D or Space (clockwise), to turn the beam faster. Click a stone slot or a tower to build, upgrade or sell. Keys 1–8 open the matching slot, Enter confirms, Esc or P pauses.
• Mobile: hold the left or right half of the screen to turn the beam faster, release to let it turn on its own. Tap a stone slot or a tower to build, upgrade or sell.

Supported browsers

Recent Chrome, Edge, Firefox and Safari on desktop and mobile. Best played in portrait on phones; use the fullscreen button on desktop. Progress is saved in your browser's local storage; if your browser blocks storage inside the game frame, progress lasts only for the current session.

Credits

• Game by HTStudio.
• Original music by HTStudio ("keep-menu" and "keep-play", composed in code). Sound effects are synthesized in code at runtime.
• Logo font: Lilita One by Juan Montoreano, licensed under the SIL Open Font License 1.1.
• Graphics generated with AI image tools for HTStudio.

Changelog

• 0.1.0: first release – 20 nights plus endless mode, 3 tower types, 4 lamp upgrades, 10 languages.