Early Access
The game is currently in the ALPHA stage of development, which means that many features are still being implemented and tested. As such, you will encounter bugs and unfinished content. The server will be wiped regularly and you'll lose all progress. If you're ok with that, then alright! By giving your feedback and reporting bugs on Discord, you're actively contributing to shaping the game as it evolves, which is great.
When you buy the game, you'll have lifetime access to the permanent servers.