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Looks like the creator is following a one-button game design philosophy.

That may make sense for some games, but for a game that has two directions, it makes less sense.

Probably better to completely disable the arrow keys -- or better, limit it to the spacebar -- to reinforce single-button design.

Or, just intuitively support left & right.

On mobile, it works really well because all u have to do is tap to change the direction. They should just remove the arrow keys on web, as you said.

Or, better, make them function as is the norm for every other game.