Yeah right off the bat:

• the menu is confusing, too much layers and clicks to get to the first level and I wasn’t even sure I was getting somewhere or what I was even doing
• once in a level I had no clue what was expected of me at first, I had to go to the “debug” to get some information, and even that wasn’t enough, I had to randomly figure out the rest
• drag and dropping units / blocks over and over is not engaging whatsoever
• it would be nice to be able to skip to more advanced topics if basic addition through grid counting isn’t something you need 25+ levels to understand

I quit after 6 levels. I would recommend to work on UI/UX. A tutorial would be nice too. And maybe don’t lock everything so the player have to do every single level to get to the next topic (I don’t even know if it’s the case, but 6 levels was too much already). Maybe open a few topics at the same time, with some progression required to get more?

Finally, I wouldn’t call that a game. I would be interested to get to more advanced topics to start learning or challenging myself, but when I want to play a game I wouldn’t go for that. From what I’ve seen of “learning games” those past 3 decades, they’re not fun, they’re not really games, they only pretend to to either attract parents to buy for their kids, or to lure people who like games (usually disappointing). Or they’re not really about learning, they’re games pretending to be educative. The making of a good game, and the making of a good learning tool, may be fundamentally too different to be compatible, or people are just bad at mixing them, save maybe rare exceptions.

In my experience, game and learning don’t go together. Either it’s a game or it’s a learning tool. Calling it a game will deter anyone actually looking for a game. But I’ll try it you never know.

I don’t know a way to do it for a given system, at home you could plug a small computer to your router, like a raspberry or equivalent, set that as a dns, and run filtering on it.