Apple TV gets Game Controllers, Apple has an accessory for you: the SteelSeries Nimbus Wireless Gaming Controller. It's available as an add-on option when you buy your Apple TV, and it's a lot cheaper than buying a second Apple Siri Remote.
The Nimbus looks like a typical game controller with the usual assortment of buttons and a D-pad. It connects to your Apple TV, iPhone, or iPad via Bluetooth and sports a rechargeable battery rated to get you through 40 hours worth of gaming, and recharges via Lightning connecter. It's priced at US$49.95.