I'd like to play Minetest with a friends over the internet (not the same network). I previously used Hamachi and it worked well but I want to use an easy and open source alternative. So is there any real alternative or should I just continue to use Hamachi?
I'd really suggest something Wireguard-based like Tailscale instead of OpenVPN for latency sensitive applications like games.
The great thing about mesh vpn's like tailscale is that each device connects directly to each other. This means traffic isn't routed through a central server, which results in lower latency. If you run game server and vpn on the same host/network/router it doesn't make a difference in latency.