Are you intimately familiar with the inner workings of your heatpump? Nearly all heatpumps in a cold climate have backup heat built in and it would automatically switch to backup when it gets too cold outside. -30C is well into the too cold category for it to function as a heatpump alone
I love ONI and Don’t Starve is hard for me to get into. ONI is a mechanical/technical base/management simulator. I’m a huge Factorio player and ONI scratches a pretty similar itch