As Always, Good Luck and Have Fun.
Arrows – Movement
S – Jump
D – Attack
C – Chain
Ctrl or Click Corner Gem – Pause and open game menu
All controls can be rebound in the game menu, though beware of some keyboards not inputting certain key combinations being pressed at the same time! The key config menu will flash keys as they are pressed, so if one of them won’t flash while another is held down, try binding different keys.