ENTER = Start Game

Esc, 1, ENTER = Pause/ Exit Skill Set/ Exit Controls

B, 1, ENTER = Select/ Change Display Mode

Esc, J, ENTER = Back/ Cancel

J = Exit "How To Play"

W, S = Navigate Main Menu/ Change Difficulty

A, D = Switch Character & Colour/ Skill Tree/ Attack, Defense, Speed/ Volume/ Language

B = Select Character & Colour/ Stage/ Difficulty/ Skill Tree/ Attack, Defense, Speed

G = Take away Skill Tree points

(I've noticed that the game likes to switch around the select and back/cancel buttons a lot depending on the menu screen. I've tried to list as many here as I can, but it gets messy very quickly so not every option is listed, but you should be able to figure it out from this.)

W = Jump
W + W (At peak of first jump) = Double jump

S = Crouch

A = Left

D = Right
(A & D = Directional Keys)

Double Tap Directional Key (A or D) = Sprint

Sprinting + W = Long Jump

Y = Change Lanes

Spam B = Revive
(Get up after being knocked down)

Hold B = Block
OR
T + I = Block
(Lasts a long time, but breaks eventually. Also it is sometimes possible on Easy Mode for the block to happen randomly by itself it seems)

G = Light Attack
H = Medium Attack
J = Heavy Attack

G + Sprinting = Forward Dash Attack
H + Sprinting = Slide Kick Attack
J + Sprinting = Forward Overhead Swing

G + W = Air Kick
H + W = Overhead Swing
J + W = Wide Swing
(Works with Double Jumps too)

G + S = Light Crouch Kick
H + S = Medium Crouch Kick
J + S = Heavy Crouch Kick

B + Directional Key = Special Attack

Hold B + Directional Key = Dash Attack
OR
Sprint + B = Dash Attack
(This will cancel any moves being performed by every enemy, send them flying back a fair distance and deal high damage)

Hold B + The opposite directional key to the way you’re facing (A or D) = Backwards leap/Dodge

I = Unknown Attack

B = SP

T = Phantom Break and Unknown Attack

U or H + J = Outrange Attack and Unknown Attack
(I, T and U are likely used for Combo moves)

This is something I stumbled across on accident.
It is activated by:

Holding B and spamming either A or D.

What it does is knock back and hurt all enemies around you, giving you breathing room, and puts up your block until you move
(like normal though the block will break eventually).

It will consume any energy you have accumulated so far.
(This is possibly an Easy Mode only ability)

From what I have seen this is a feature, though I don't know what it does beneficially. I would presume it would block the enemies attack and deal extra damage to the enemy which just got countered.

I am yet to figure out how to actually do it consistently, I think it just has to do with doing an attack at the same time an enemy does, negating the enemies attack.