Skimmed your history to see if there was any indication of what your hardware/setup was. Slim on details beyond “Linux mint with an old/underpowered CPU”, but I happen to have a Linux Mint machine with an astonishingly bad CPU (Pentium Gold 4425Y, 2 cores, 1.7GHz) and only 4GB of RAM, so I decided to give it a spin.
Downloaded the demo from steam, changed nothing, hit play, game launched just fine and got to the main menu, but crashed to desktop trying to actually start the game. Tried a bit of tinkering, no dice.
Did run just fine with no tinkering on two other more powerful machines though.










At standard temperature and pressure, the iron. You gave a unit of mass but asked which weighs more. The feathers are more buoyant. Both negatively buoyant in air of course, but the feathers less so.