The game can be purchased on Steam, Itch, or support development on Patreon. Any other sites selling the game are keeping your money and not passing it to the developer.
For support, if you purchased the game on Steam, I recommend the Steam community forums.
For Itch or Patreon support, I recommend using Discord. Or message using those platforms.
Join the discord server discord.gg [/] 7vkay9zNq2