Running games is currently WIP, but it's making a lot of progress. Compared to wine, this fully sandboxes the process. So no intended way for an attacker to escape and e.g. access files on your PC, if the game is vulnerable, compared to wine
I gladly accept pull request. I'm bad at webdesign and I'm not that big of a fan of AI generated pages (although I gotta admit I AI generated the landing page; hence I'm not a big fan of it). So if you have inspiration on how to improve it, especially on how to better present the project, feel free to tell me, or create a PR.
Hey, author here, I agree with you. Landing page is shit. I will rework it, but at the moment, I'm rather focusing on improving the project itself.
To answer your actual question, it does both. It emulates both windows and linux (although linux implementation was done by a contributor and it's probably not as evolved as the windows part). It also does so on every platform, so you can emulate windows on your android/ios phone, even on the web. It cross compiles to pretty much every platform.
It supports various emulation backends, e.g. Unicorn (which uses QEMU under the hood), but also Hyper-V on windows. That's where the sandboxing part comes in to play: As Hyper-V is pretty fast, the emulator starts turning into a sandbox.
Maybe some day I can add KVM support so you can run sandboxed Windows apps on Linux, but I haven't had the time yet. So at the moment, only the slow emulation backends work on Linux.