private void tick() {
		input.tick();
		world.tick();

		if(input.isMousePressed()) level.addEntity(new ParticleEmitter(input.centrex / pixelSize.getX() + screen.xOffs, input.centrey / pixelSize.getY() + screen.yOffs, Emitter.Type.COLLISION, 100l, 1));
//		level.addEntity(new ParticleEmitter(player.getX() + 8, player.getY() + 8, Emitter.Type.BASIC, 100l, 1));
	}