Here's the code!

Create event:

/// Create event

// Main

hsp = 0 // Horisontal speed

vsp = 0 // Vertical speed

// Physics

grav = 0.3 // Gravity

move_sp = 5 // Move speed

jump_f = 10 // Jump force

Step event:

/// Step event

// Keys imput

right_k = keyboard_check(ord("D")) // Right key imput

left_k = keyboard_check(ord("A")) // Left key imput

jump_k = keyboard_check_pressed(vk_space) // Jump key imput

// Physic and else

move = right_k - left_k // Move imput

hsp = move * move_sp // Walk physic imput

vsp += grav // Gravity physic imput

// Jump logic

if (place_meeting(x,y+1,obj_solid)) and (jump_k) // If player pressed the jump button on the ground

{

vsp -= jump_f // Jump system logic

}

// Collisions

// Horisontal collision

if (place_meeting(x+hsp,y,obj_solid)) // Collision with ground

{

while (!place_meeting(x+sign(hsp),y,obj_solid)) // If there wasn't any collison

{

x += sign(hsp) // Player can move

}

hsp = 0 // Player can't move

}

// Vertical collision

if (place_meeting(x,y+vsp,obj_solid)) // Collision with ground

{

while (!place_meeting(x,y+sign(vsp),obj_solid)) // If there wasn't any collison

{

y += sign(vsp) // Player can move

}

vsp = 0 // Player can't move

}

// X and Y imput

x += hsp

y += vsp