I can't think of any specific maths games, but Baba is You is an excellent game for training logical thought.

You could always go to the browse games section and search 'maths' (or 'math', if you're American) and see if there's anything you fancy :)

Here's a cute colorful puzzle game that seems suitable for children (it's not about numbers, but I guess it trains logical thinking): https://programancer.itch.io/dumpy

Here's another cool puzzle game, probably better for teaching math skills, but less aimed at children: https://danijmn.itch.io/cardinalchains