better collision detection and other stuff

js/Rect.js

 	}
 
 	intersectSide(other) {
-		if (this.midY < other.top)
-			return "top";
-		else if (this.midY > other.bottom)
-			return "bottom";
-		else if (this.midX < other.left)
+		let mx = this.midX;
+		let my = this.midY;
+
+		let diffleft = mx - other.pos.x;
+		let diffright = mx - (other.pos.x + other.size.x);
+		let difftop = my - (other.pos.y + other.size.y);
+
+		if (diffleft <= 0)
 			return "left";
-		else
+		else if (diffright >= 0)
 			return "right";
+		else if (difftop >= 0)
+			return "bottom";
+		else
+			return "top";
 	}
 
 	contains(other) {

js/Shaker.js

 	update(dt) {
 		if (this.shakeX > 0.1)
 			this.vec.x = (Math.random() - 0.5) * this.shakeX * dt;
+		else
+			this.vec.x = 0;
+
 		if (this.shakeY > 0.1)
 			this.vec.y = (Math.random() - 0.5) * this.shakeY * dt;
+		else
+			this.vec.y = 0;
 
 		var xRatio = 1 / (1 + (dt * this.decay));
 		this.shakeX *= xRatio;

js/traits/TKeyboardController.js

 		this.speedAir = 20;
 
 		this.jump = 8;
-		this.jumpTimeMax = 0.4;
-		this.updrift = 87;
+		this.jumpTimeMax = 0.45;
+		this.updrift = 100;
 		this.jumpLeeway = 0.1;
 
 		this.map = {
 			KeyA: 'left',
 			KeyD: 'right',
+			KeyW: 'up',
+			KeyS: 'down',
 			Space: "jump",
 		};
 
 			phys.velocity.x -= speed * dt;
 		if (this.pressed.right)
 			phys.velocity.x += speed * dt;
+		if (this.pressed.down)
+			phys.velocity.y += speed * dt;
+		if (this.pressed.up)
+			phys.velocity.y -= speed * dt;
 
 		let canJump =
 			!this.jumped &&

js/traits/TPhysics.js

 		} else if (side === "right" && this.velocity.x < velocity.x) {
 			this.velocity.x = velocity.x;
 			this.entity.bounds.left = bounds.right;
+		} else if (side === "bottom" && this.velocity.y < velocity.y) {
+			this.velocity.y = velocity.y;
+			this.entity.bounds.top = bounds.bottom;
 		}
 	}