Hypersomnia is a free and open source top-down competitive 2D shooter

Feeling competitive? Hypersomnia from Patryk Czachurski is a top-down 2D competitive online shooter. It's free, open source and you can play it via Steam or directly in your browser. The developer of it mentioned they wrote it in C++ without using a game engine, and some of the code they've written (rectpack2D) was even used in the likes of Assassin's Creed: Valhalla.

What's their aim with it? They want it to become the "ultimate open-source 2D shooter - a grand community project extensible without limit". A lofty goal but perhaps they just might be able to do it, if they get some more eyes on it and what they've been able to do with it is quite impressive.

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Some highlights:

• 24 unique firearms.
• 2 game modes: Bomb defusal (team-based) and Gun game (free-for all).
• 6 magic spells, 4 grenade types and 7 melee weapons.
• An in-game map editor that lets you host a work-in-progress map to test with your friends in a single click. Quickly iterate your map unlike in any game engine.

Writing about the game the developer mentioned in our Discord: "The netcode relies on full simulation determinism - this includes Box2D physics. I'm using standard floating-point calculations and rely on IEEE754 compliance. I also use STREFLOP for portable math function implementations. This is commonly done for RTS games with a lot of synchronized units, however this technique is rarely if ever seen in games with complex physics, esp. shooters." — sounds like some impressive tech going on behind the scenes.

Check it out free on Steam, play via the website and see the code on GitHub (AGPL-3.0 license). It has Native Linux support too of course.