[Up] = W
[Down] = S
[Left] = A
[Right] = D

[Attack] = U
[Jump] = I
[Special] = O (not implemented)

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[Jump] in the air = double jump
[Down] + hold [Jump] = dash
[Down] + [Jump] in the air = air dash
[Up] + [Jump] = back dash

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Combo:
attack -> attack -> attack
attack -> attack -> delay -> attack