Privacy Policy

Last updated 31 August 2026

Who is responsible

MGDB Studio is the name I release my games under. Behind it is one person in Poland, and that person, me, is the data controller. Write to [email protected] and you reach me directly; there is no support desk in between. I confirm my full identity on request to that address, and to any supervisory authority that asks for it.

Nothing is sent until you agree

The first time you launch KERF you are asked whether the game may send anonymous diagnostic data. Until you choose Yes, nothing leaves your computer. If you choose No, nothing leaves your computer, ever, and the game works exactly the same.

You can change your mind whenever you like, in Settings → Gameplay → Send anonymous data about how the game runs. Turning it off also deletes any batches still waiting on your disk.

What is sent, if you agree

Once per session, one small record describing your setup:

• a random installation identifier, generated on your computer, with no connection to your Steam account, your name or your e-mail address
• game version, game language, operating system and driver version
• graphics card, processor, amount of memory, screen resolution
• how long the session lasted

Alongside that, a short list of gameplay events, batched and sent about once a minute:

• starting a new game, loading a save, returning to the menu
• reaching a new reputation level
• buying an upgrade card, and which one
• hiring your first cashier and your first worker
• finishing a minigame, and how it went
• a machine standing idle for want of material
• a customer leaving without being served
• errors and crashes, together with the place in the code where they happened

My server also records the two-letter country code that Cloudflare attaches to the request, so I know roughly which regions the game is played in. Your IP address is not stored.

What is never sent

• your name, nickname, Steam account or e-mail address
• your IP address (it is not written to the database)
• your save files, unless you explicitly choose to attach one to a bug report, in which case you see what you are sending before it goes
• screenshots, chat, keystrokes or anything from outside the game
• anything at all if you declined, or later switched it off

Twitch and Kick, if you stream

KERF has an optional feature for streamers: people chatting in your Twitch or Kick channel show up in the game as customers walking around your sawmill, wearing their chat nickname. It is off unless you switch it on by entering your own channel name in Settings, and it is completely separate from the diagnostic data described above.

While it is on, your game reads the public chat of the channel you named. That connection runs directly between your computer and Twitch or Kick - it does not pass through me, and I never see it or store anything from it. Viewer nicknames are drawn on the characters on your screen and nowhere else: they are not written to your disk and not sent anywhere. Turn the feature off and the connection stops.

What Twitch and Kick themselves do with the connection is covered by their own privacy policies, not by mine.

Why I collect it

Legal basis: your consent (Article 6(1)(a) GDPR). I use the data to find crashes and performance problems on hardware I do not own, and to see where players get stuck or stop playing, so I know what to fix and what to build next. It is never used for advertising, never profiled against an individual, and never sold or shared with anyone.

Where it is kept, and for how long

The data is stored on Cloudflare infrastructure in Western Europe. Cloudflare acts as my processor; see the Cloudflare privacy policy. Records are deleted automatically after 12 months. Nobody but me has access.

Your rights

Under GDPR you may ask for a copy of the data connected to your installation, ask for it to be corrected or deleted, withdraw your consent, or complain to a supervisory authority (in Poland: the President of the Personal Data Protection Office, UODO).

Because the data carries no name, I need the installation identifier to find your records. The game shows it in Settings → Gameplay, underneath the toggle. Send that identifier to [email protected] and I will delete everything attached to it. I answer these myself, usually within a few days.

Children

KERF is not directed at children under 16, and I do not knowingly collect data from them.

Changes

If I ever start collecting something not listed above, I will update this page and ask for your consent again inside the game. The date at the top always reflects the current version.