First thing I've gotten done in months - I should be happy, but I'm still disappointed...

character.gd

extends CharacterBody2D

const MOVE_FORCE: int = 150
const JUMP_FORCE: int = 500
const FRICTION_FORCE: float = 0.9

const GRAVITY_DOWN: int = 25
const GRAVITY_UP: int = 15
const MAX_SPEED: int = 350

#TODO: buffered jumps
#TODO: coyote time

func _process(_delta):
	var inputForce: Vector2 = Vector2.ZERO
	
	#left
	if Input.is_action_pressed("player_1_left"):
		inputForce.x -= MOVE_FORCE
	if Input.is_action_just_released("player_1_left") && velocity.x < 0:
		inputForce.x += MOVE_FORCE
	
	#right
	if Input.is_action_pressed("player_1_right"):
		inputForce.x += MOVE_FORCE
	if Input.is_action_just_released("player_1_right") && velocity.x > 0:
		inputForce.x -= MOVE_FORCE
	
	#jump
	if Input.is_action_just_pressed("player_1_jump") && is_on_floor():
		inputForce.y -= JUMP_FORCE
	
	#lock it in
	velocity += inputForce

func _physics_process(_delta):
	#gravity
	if !is_on_floor() && velocity.y < 0:
		velocity.y += GRAVITY_UP
	else:
		velocity.y += GRAVITY_DOWN
	
	#limits
	if is_on_floor():
		velocity.x *= FRICTION_FORCE
	
	if abs(velocity.x) > MAX_SPEED:
		velocity.x = sign(velocity.x) * MAX_SPEED
	#if abs(velocity.y) > MAX_SPEED:
	#	velocity.y = sign(velocity.y) * MAX_SPEED
	
	#do the thing
	move_and_slide()