Always moving to the right

[hollow atlas]

You are increasing the y for the right movement...

Step event
"if (keyboard_check(vk_left)) {
x -= speed;
}
if (keyboard_check(vk_right)) {
x += speed;
}
if (keyboard_check(vk_up)) {
y -= speed;
}
if (keyboard_check(vk_down)) {
y += speed;
}"

that's more like it, i think?

[lyric lily]

speed is a built-in variable that works together with direction, another built-in variable. direction is 0 by default, meaning it points to the right.

Which means if you have speed set to 1, you'll always move to the right.

[hollow atlas]

or this i guess

[lyric lily]

No, it has nothing to do with scripts.

If you want to use a custom speed variable, name it something else.

Like move_spd.

Setting speed enables automatic built-in movement.