diff --git a/engine/Vector.ts b/engine/Vector.ts
index 840e509..2e78f62 100644
--- a/engine/Vector.ts
+++ b/engine/Vector.ts
@@ -87,3 +87,5 @@ export function isBelowAbs(vector: Vector, abs: number): boolean {
 export function equals(a: Vector, b: Vector): boolean {
 	return a.x === b.x && a.y === b.y;
 }
+
+export const ZERO = createVector();
diff --git a/engine/system/physics.ts b/engine/system/physics.ts
index 1042d68..d17c61f 100644
--- a/engine/system/physics.ts
+++ b/engine/system/physics.ts
@@ -20,6 +20,8 @@ const CIRCLE = Shape.Circle;
 const RECT = Shape.Rect;
 const POLYGON = Shape.Polygon;
 
+const EPSILON = 0.0001;
+
 type CollisionBuffer = {
 	size: number;
 	mask: number;
@@ -528,7 +530,7 @@ export function moveAndSlide(
 			break;
 		}
 
-		const scalar = Math.max(0, time - 0.001) * delta * timeLeft;
+		const scalar = Math.max(0, time - EPSILON) * delta * timeLeft;
 		position.x += velocity.x * scalar;
 		position.y += velocity.y * scalar;
 
diff --git a/game/entities/portal/entity.ts b/game/entities/portal/entity.ts
index 9126d74..b8599c4 100644
--- a/game/entities/portal/entity.ts
+++ b/game/entities/portal/entity.ts
@@ -13,7 +13,6 @@ const portalSrc = await defineSpriteSheet(portal, 3, 1);
 
 defineEntity("portal", {
 	position: createVector(),
-	velocity: createVector(),
 	collider: createCollider(Shape.Circle, createCircle(8)),
 	sprite: createSprite(portalSrc, createVector(-8, -8)),
 	animation: createSpriteAnimation(400, 0),