Unless you trademark the title you can’t do anything about it. And an international trademark cost a lot of money.

I wouldn’t worry too much about it. The copy doesn’t look like a game that can compete. It looks very barebones. The Steam algorithm will bury this game because it won’t sell. You probably gave this game more publicity than it ever got before. Just focus on your own game the more wishlists you get the more the algorithm will push your game to customers and they will never see the copy.