I won't go into technical details of the console here. You can find more information about it on it's website [0] or it's github repo[1]. You can check the console out with its emulator[2], which can run in your browser with the game listed here[3]. I also wrote a post about developing a game for the GameTank[4], which might give an idea of what it's like to make a game for the system.
[0] https://gametank.zone/ [1] https://github.com/clydeshaffer/gametank [2] https://github.com/clydeshaffer/GameTankEmulator/ [3] https://gametank.zone/games [4] https://nickgirardo.com/posts/avhg-thoughts.html