Penumbra

Penumbra is a mouse-based survival game — hold off shadow monsters long enough to open a portal to escape the Shadow Realm!

Created in 48 hours for the 2025 GMTK Jam.

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How to play: (recommend fullscreen)

On Desktop: use mouse and left click to create loops to kill enemies and collect 'motes of shadow'.

On Mobile: draw loops to kill enemies and collect 'motes of shadow'.

Collect 30 'motes of shadow' to enable the 'Open Portal' button or swing by grumbo's shop to buy some frivolous hats!

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You and your acolytes have entered the Shadow Realm in search of power to fuel your dark magic. Beginning a ritual to attract the attention of the creatures that live there, you must destroy the shadowlings and harvest their essence, collecting enough to make your journey worthwhile, before escaping through the portal that you have prepared. Your magic is powerful, but you and your disciples only have so much attention, forcing you to decide where and when to deploy your spells. Can you survive long enough to bring home a massive bounty? Or will the onslaught of the Shadow swallow your cult before you can escape?

- All graphical assets were made by the team, using Aseprite, Piskel and Blender. Sound effects were made using jsfxr, Quanta, and Audacity. The following sound clips were obtained from Freesound:

MUS152 Slow breath_1 Thy Nguyen.wav by ThyNguyen92 -- https://freesound.org/s/448858/ -- License: Creative Commons 0

Light Thud 3 by sgrowe -- https://freesound.org/s/342531/ -- License: Creative Commons 0

Both music tracks were made using royalty-free loops from GarageBand.