I made an autosplitter for Core Keeper! It starts the timer for you and can split when you place the crystals in the Boss Statues. There are options to split when each Boss Statue is activated and when the Core is activated. Core Activated is an alternative option because activating all 3 statues activates the Core. The timer also resets automatically for incomplete attempts when you exit to the title screen.

To enable the autosplitter: Right Click on Livesplit -> Edit Splits... -> Click Activate

To change when to split: Click Settings next to Activate -> Check or Uncheck the boxes in the Advanced options