My understanding is that choosing the 'VoxeLibre' (formerly 'MineClone2') game will get you the most MineCraft-like experience available on the 'MineTest' engine.
https://content.minetest.net/packages/Wuzzy/mineclone2/
If you're going to play on the device that serves the game, choose the 'Host' tab after choosing 'VoxelLibre/MineClone2', create a world, choose a username, and press 'Host Game'.
You'll need to do a little research to figure out what your Samsung devices IP addresses are.
There's an internal IP for friends playing with you on the same WiFi, and an external IP for friends across the Internet.
To play on the same WIFI, just give your friends the internal IP. Have them press Register and then Login.
To play with friends outside your local WIFI, you'll need to also pinhole port 30000 to your device, using your router configuration.
Note that this is exactly the same IP situation as with Minecraft Java edition. So you can follow any guide that works for Java Minecraft and it will work for MineTest. The only difference is that the MineTest port is always 30000, unless you change it.