A CodePen by Simon FREMAUX. Lost In The Dark - My js1k entry - https://github.com/dievardump/js1k/

index.html

<canvas id="c"></canvas>

script.js

(function () {
  'use strict';
	
	var b = document.body,
	    c = document.getElementsByTagName('canvas')[0],
		a = c.getContext('2d');
	document.body.clientWidth; // fix bug in webkit: http://qfox.nl/weblog/218

	// inspired by a picwin ( mIRC ) contest i saw many years ago
	// the contest was a 512b picwin snippet. 
	// source : http://scriptsdb.org/comments.php?id=1125
	b.bgColor='#000';
	var L="♥", 
		iWidth = c.width = b.clientWidth,  // canvas width
		iHeight=c.height=b.clientHeight, // canvas height
		oPos = { x : 50, y : 50 }, // heart position
		oSize = { w : 30, h : 50 }, // thing width and height
		iLum = 255, // luminosity
		aThings=[], // all things container

		oCurrentEllipsis = { x: 130, y : 200},
		oNextEllipsis = { x: 130, y : 200},
		iStep=0;

	// calc all things positions
	var m = -oSize.w, q =0; // m and q are x and y pos for things
	while(m<iWidth||q<iHeight)
	{
		aThings.push( { x : m, y : q } ); // add a thing
		if (m>iWidth) { // if we are at the max right
			m=-oSize.w; // return to left
			q+=oSize.w*1.5; // next line
		}
		m+=oSize.h;
	}
	function process() {
		// move the heart
		fnMove();

		// pick just visible things
		var aVisible = [];
		for(var i = aThings.length; i--; ) 
		{
			var oCurrent = aThings[i], 
				hypo = Math.sqrt(Math.abs(Math.pow(oPos.x-oCurrent.x,2)+Math.abs(Math.pow(oPos.y-oCurrent.y,2)))); // calc dist from thing to heart
			if (hypo<iLum+oSize.h && hypo>oSize.w) { // if thing is not too far (255px+thingHeight) and not too close ( thig width )
				aVisible.push({dist:hypo, x:oCurrent.x,y:oCurrent.y}); // set thing as visible
			}
		}
		// sort thing by dist to have a "pretty" print
		aVisible.sort(sortByDist);

		a.clearRect(0, 0, iWidth, iHeight); // clear canvas
		var oVisible = null, 
			radius = null;
		for(i=aVisible.length;i--;){ // for all visible things
			// save current canvas state to manipulate it
			a.save(); 
			oVisible = aVisible[i];
			radius = Math.acos((oPos.y-oVisible.y)/oVisible.dist); // calc horizontal radius between thing and heart

			radius *= (oPos.x-oVisible.x>0) ? -1 : 1;
			a.translate(oVisible.x,oVisible.y); // translate the canvas
			a.rotate(radius); // rotate canvas 

			// calc luminosity for this thing
			var iCurrentLum = -Math.floor(oVisible.dist-iLum);
			if ( iCurrentLum > iLum ) { // avoid luminosity > 255
				iCurrentLum = iLum;
			} else if (iCurrentLum < 0 ) { 	// avoid luminosity < 0 
				iCurrentLum = 0; 
			}
			// draw the thing
			a.beginPath();
			a.lineWidth=oSize.w;
			a.lineCap='round';
			a.moveTo(0,0);
			a.lineTo(0,oSize.h);
			a.strokeStyle='rgba('+iCurrentLum+',0,0,1)';
			a.stroke();
			a.closePath();

			// restore state
			a.restore();
		}

		//draw the heart
		a.textAlign="center",     
		a.textBase="middle",  
		a.font="42px a",          
		a.fillStyle="red",        
		a.fillText(L,oPos.x,oPos.y);
		

		//loop process
		setTimeout(process, 33);
	};

	// function to sort thing by DESC dist
	function sortByDist(a, b){
		return b.dist-a.dist
	};

	// function which set new heart coord "randomly" around an elipse
	function fnMove() {
		var radius = 0;
		// check if we are at the new coords
		if (oCurrentEllipsis.x==oNextEllipsis.x) {
			oNextEllipsis.x= Math.round(Math.random()*iWidth/2);
		}

		if ( oCurrentEllipsis.y==oNextEllipsis.y ) {
			oNextEllipsis.y= Math.round(Math.random()*iHeight/2);
		}

		//set new dir.x
		if ( oCurrentEllipsis.x < oNextEllipsis.x ) {
			oCurrentEllipsis.x++;
		} else {
			oCurrentEllipsis.x--;
		}

		// set new dir.y
		if ( oCurrentEllipsis.y<oNextEllipsis.y ) {
			oCurrentEllipsis.y++;
		} else {
			oCurrentEllipsis.y--;
		}
		// we change the radius counting on steps
		radius=iStep/30;
		iStep++;

		// the point where we are suppose to go next
		var dir = { 
			x : Math.cos(radius)*oCurrentEllipsis.x+iWidth/2,
			y : Math.sin(radius)*oCurrentEllipsis.y+iHeight/2
		};

		// check if we change direction
		var oDiff = { 
			x : oPos.x-dir.x,
			y : oPos.y-dir.y
		};

		if ( oDiff.x != 0 || oDiff.y !=0 ) {
			oDiff.x*=-1;
			oDiff.y*=-1;
		}

		oPos.x += oDiff.x;
		oPos.y += oDiff.y;
	};
	process();
}());

style.css

html, body {
  width : 100%;
  height : 100%;
  position : relative;
  overflow : hidden;
}