I will be truly glad to buy the physical version but TWF8bit sadly doesn't ship to Slovenia (EU).
I don't work for TFW8Bit, but I do know international shipping is a bit of a nightmare. When packages are shipped to certain countries, the packages can be hit with not only tariffs and taxes but flat (+expensive) fees that are tacked on by the carrier and the receiving government. Those fees by the shipping company are to cover the crazy paperwork of local governments. DHL is one of the friendlier shipping companies in the sense their fees are more reasonable. When I say reasonable, I don't mean cheap, but DHL tends to deliver the package on time (important) and doesn't charge extra fees that makes a buyer think they are just using their "fees "to pay for their executives' next lavish vacations.
When sellers ship to countries that are not international friendly, the charges/fees can be so extreme by the local government that buyers will refuse the package and demand a refund. That leaves sellers in the position where they not only don't make a sale, but they eat the shipping costs of the package and the return too. Bottom line, sellers need to selectively pick to ship to specific countries, or they get royally fleeced (which will make sellers regret making a sale).
The other issues is that buyers often don't expect those fees (or think they are too high), so they might just think sellers are trying to make even more money, and refuse the package delivery. Depending on which country, buyers are often more or less aware of these fees, so banning some countries outright (sadly) is often done to prevent massive losses.
I can't speak to your specific country, nor do I know TFW8Bit specific policies, but I hope this helps explain the problem... I wish it were different...
Raymond, thank you for reaching out and for explaining. I know all about what you said. I am a great retro computer lover, especially the C64 which is and will bi my first love. I am practically ordering on monthly basis stuff from the UK. And yes there are taxes and import fees to pay after the Brexit in our country, but so it is from the US etc. I will gladly pay all of the fees to have a physical copy of this fabulous and great adventure. But fortunately I own a Kung Fu cartridge and I can play the game on real hardware if I want.
Please see my collection, so you can see some fee is not an issue for me.
Congratulations for your work and keep up with it.
Very best regards, Sincerely, Martin 
Nice collection! I love how shinny the boxes look making everything appear new still. Mine have dulled with age. Yes, fortunately the Kung Fu flash works well. I wasn't speaking on behalf of the TFW8Bit (since I'm not affiliated), but you could always reach out to them and ask if ever you wanted to order something. I can't say if they'd can make special cases or not but it doesn't hurt to ask... Nice to see the spectrum joined the group :-)