Hi voxel,
Glad you liked it :) - similar to you I grew up in the 90s so games like this are special to me too.
I do agree the AI could do with a bit of tweaking ("easy" is pretty random, but the others do have a bit of logic to them). I've a couple of ideas to implement based on what folks have said: a "base" level of points for medium/hard before they start building on squares already with pieces, which I should have enough tokens for.
Interesting thought of the AI colouring the square in when they play. I definitely could do that. I did take it out originally because I found it too flashy and maybe a trigger factor for epilepsy. But since then I've introduced the thinking time graphic to slow it down a bit, so that could be readded.
I've added it to the list.
Thanks again for playing :)