Thank you so much for the feedback!
Yes, it does seem similar to Tafl (I wasn't familiar with it, but I'd love to take a closer look).
I came across the game "Pusunčík" (hard to say how to translate it, it's something like 'Pusher' but in old English ), or more recently called Logaterix, by accident. It seemed to me to be very simple and yet terribly difficult 😊
You got the L stroke absolutely right!
I don't know any other Slavic game, unfortunately. But I did come across (again by accident) the Indian game Pikaria - I may try to make it too, as I haven't seen it exist on PC...
http://www.deskovehry.info/pravidla/pikaria.htm
As far as intelligence goes, it's definitely better to try the PC version. The online version goes through about 10x less combinations due to server speed.
Thanks again! ☺️