Discord link is in the game description: https://discord.gg/RTRC6wquuD
The normal soft limit is 1x; it's 10x in CC.
Each wave gives 0.1%/.001x normally, or 1%/.01x in CC. The soft limit is 1000 both in and out of CC.
"Channel Heat" upgrades don't upgrade the capacity of heat, they upgrade your work speed.
The upgrades that increase your heat capacity are "Heat Sink Expansion".
Slingshot yourself with gravity. Jump in the blue, then let gravity accelerate you towards the green.
Make bigger protostars. The mass is the sum of all your protostars.