Thank you for the update. ^_^
I've just tried it, and alas, the problem seems unaffected. :/
I noticed this time by the way that the magenta triangle seems to respond to the mouse, floating in a direction opposite to the mouse's movements.
Oh, and my system information, in case it's useful:
Dell Inspiron 15 3000 Series
CPU: Core i7 2.4GHz (4-core)
Memory: 8GB
Graphics: GeForce 840M, 2GB (+Intel integrated)
OS: Ubuntu 18.04.4
(Other Unity games have worked in the past, including here on itch, so if it's an incompatibility of some sort with Unity then it's a fairly specific one, not a general one.)