Hi, thanks for your interest in Cave! I really appreciate it.
We previously had a free version for a long time, but after careful evaluation, we found that maintaining it was not sustainable for us—both technically and financially. It also significantly impacted our ability to provide quality support and continue improving the engine.
Because of this, we’ve decided to focus entirely on the paid version, and we don’t have plans to release a free/demo/trial edition. That said, I understand that many of you would like to try Cave before purchasing, so we’re working on providing as much in-depth content as possible on our YouTube channel to give you a clear look at what the engine offers.