If the mouse cursor is invisible when running Tiny Glade, it's usually due to video capture software interfering with the game.
If you use an app called Medal, please refer to its own troubleshooting page.
If the cursor is invisible while streaming/recording with OBS, try changing the screen capture method. Reportedly, the "Windows 10 (1903 and up)" method can cause this issue.
Some players experience this problem if they have "Display pointer trails" enabled in the Control Panel. Microsoft Insider (preview) versions of Windows are also known to be problematic.
Windows HDR mode might also be the culprit.
Switching Tiny Glade to windowed mode via Alt-Enter or F11 might also help.
On Linux, it's probably Wayland-related; see here.
Since 1.14.3, Tiny Glade can draw its own cursor, which should work around OS issues.
You can enable it inside the game, under Settings → UI → Custom cursor.
To navigate there using the keyboard:
Esc to open the menuDown Arrow three times to highlight the gear iconEnter to go into SettingsPage Down three times to switch to the "UI" tabDown Arrow a few times to navigate to "Custom cursor"Right Arrow to toggle the option to "Yes"