I will not tackle to what the OP is advertising to us because we might still see some blockchain games being created still, but I'm not interested on them anymore.
Re: Is it valid to invest in a gaming projects?
It's not us that decide your investment. It's you that will decide on it.
Asking to us whether it's valid to invest in gaming project is like you are relying your money to some strangers like us, and it isn't a good strategy. Always, always ask yourself whether it's still valid to invest on that type of project or not. Gaming projects isn't the hype anymore, but there are still a few games that are being created, and one of them is the XAI (though I didn't look at it).
Most of the gaming projects aren't that entertaining, and that's a fact. Most of the blockchain games are focusing on the aspect of earning money, and not on the aspect of it being fun to play. After Axie Infinity, I don't think if I will ever touch any blockchain games still, but as a gamer, if I will pick some games then I'll go on what I love to play which is MMORPG games.