Hi there! I understand your Overmortal Idle RPG app keeps closing about 20 seconds after you start playing, and you've already tried reinstalling and cleaning crashes twice without success. Let’s dig a bit deeper to get this sorted out.

Could you tell me a little more? For instance:
- Are you running the game on a Windows PC or maybe via an emulator on Windows?
- Do you notice any error messages when it crashes, or does it just close suddenly?
- Has this issue started recently after an update or change to your system?

Meanwhile, here are some steps tailored for a Windows 10 environment that might help:

1. Close Background Apps
Sometimes other applications interfere with the game. Try closing unnecessary background programs, especially antivirus or overlay apps like Discord or Steam overlays.

2. Run as Administrator
Right-click the game shortcut and select “Run as administrator” to see if permissions are an issue.

3. Check for Windows Updates
Ensure your Windows 10 is fully updated, as missing system updates can cause instability.

4. Update Graphics Drivers
Outdated or corrupt graphics drivers can cause crashes. Go to your GPU manufacturer's website (NVIDIA, AMD, or Intel) and download the latest drivers.

5. Disable Compatibility Mode
Right-click the game’s executable, go to Properties > Compatibility tab, and make sure no compatibility mode is enabled.

6. Check Game Files Integrity
If you're running Overmortal via some platform like Steam, you can verify the integrity of game files. But if it’s a standalone installation, try reinstalling ensuring to fully delete the game data folder (sometimes leftover config files cause crashes).

7. Adjust Graphics Settings
If the game starts but crashes quickly, try lowering graphics settings if you can access them, or checking if there is a config file you can edit to set lower settings manually.

8. Check Event Viewer
Since you are on Windows, press Win + X > Event Viewer > Windows Logs > Application. Look for error logs around the time the crash happens. This can give us more clues.

If you’ve tried similar steps already, let me know what exactly, and if possible, share any error messages or logs. That way, I can assist you more precisely or escalate as needed.

Are you happy to try these steps, or is there anything specific you’ve already done that you want me to skip?