First, really nice game! And available for Linux too, yes!

So here's a small bug report, when the mouse pointer is hidden (some dialog is in progress or some cutscene) the mouse turns into a small white box (the size of the normal game pointer). Strange thing is I cannot take a screenshot because in the shot it ends up as the normal os mouse pointer. I am using Linux Mint 19 (based on Ubuntu 16.04 x64). Maybe someone else can confirm this behaviour. After the cutscene/dialog the pointer correctly turns again in the custom game mouse pointer.

Thank you so much for reporting this. We just released an update that fixes the issue with the white square cursor during NonInteractives. If you use the itch.io app, you'll get the update automatically.