I started playing Deponia and it seems like I'm missing a crosshair to calibrate the harpoon. Is that a bug?

It is, the puzzle is skippable though.

Thanks. Another mini game is bugged (no pigeons, non-clickable buttons) so I decided to report it to developers.

Same for me.

Missing crosshair to calibrate the harpoon.

Hm... and eight years later the error is still occurring!

Were there solutions?

Bugged some video settings option. Try turn on/off something there (texture compression or like that). Also game work in Borderless full screen Windowed mode although call it Fullscreen. Non exclusive mode allow overlays to work above... But that sometimes lead to window focus lost kr visual glitches. Try regular Windowed or edit config file for native exclusive fullscreen. Also try reduce an one step lower resolution.

Also find a way to limit game FPS (RivaTuner RTSS or video driver or NV Inspector for Nvidia (better than Control Panel)). Not sure about 119 but higher than 144 (or unlimited) definitely lead to bugs.

Bug with setting fixed in some Deponia games in some versions and re-appear after another updates or in another Deponia game (Doomsday). GOGs builds are a bit outdated - as it is mean more bugs it also mean less bugs.