Symergy

Symergy is a Die and Retry Platformer where the world follows one specific rule: As above, so below. You control a character who can switch between the light world above and the dark one below. All the actions performed in one world may echo distinctively on the other. Outsmart traps and fight monsters in a thrilling adventure to collect all five Emerald Tablet Fragments.

Controls:

[QD]    to move left and right

[SPACE]    to jump
[L.SHIFT]    to dash
[A]    to attack
[TAB]    to Switch World
[ESCAPE]    to pause menu

You can also play with a gamepad, and there is settings menu for keybinding.