Small downloads
A game on GAMEFREEX downloads when you open its page, and most of them are small. Jump Cat's own code is about 70 KB, plus a drawing library of around 1 MB that it shares with Linea Skater. Cosmotrain, a 3D game with 99 wagons, is under 100 KB of game code on top of a shared 3D library. Pages and game files you open are kept by your browser, so a game you played once also works offline.
No updates to manage
When a game gets a fix, the next time you load the page you have the new version. There is no store update to approve and no old version stuck on your phone.
What syncs and what does not
With a free account, your high scores and Freex Coins are saved on the server and follow you to any device where you sign in. Progress inside the longer games works differently: Mossu, Supercar Dream, Bubble Tea Time, Cosmotrain and Bitling Rescue save in your browser, on the device you play on. Switch phones or clear your site data and those saves start over. That is the main trade-off of the browser approach, and it is worth knowing before you put hours into a grove or a garage.
Permissions and ads
No game asks for your contacts, location, camera or microphone. The only sensor any game uses is the motion sensor in Bounce Freex, for optional tilt steering, and dragging works without it. The site is paid for by ads served by Google. They never appear during gameplay, rewarded ads are optional, and the consent message lets you accept or refuse personalized ads. You can change that choice any time from Privacy settings in the footer. The privacy policy has the details.
Where an app would do better
You need a connection to load a game the first time. After that, it works offline. The 3D games, such as Meow Smash and Neon Xenon, lean on your device's graphics chip, and older phones can struggle with them. If that happens, the 2D games are much lighter.
Making it feel like an app
The Install the app button in the side menu puts GAMEFREEX on your home screen or dock and opens it in its own window, without the address bar. From there you can store every game for offline play, about 15 MB in total. Playing GAMEFREEX offline explains how.