Not exactly.
Our game is free - the current public version is always available for free. At the moment it's version 0.1.5.1.
Those who support us on Patreon, Boosty, or Subscribestar get early access to the next update (about 2-3 weeks earlier). At the moment it's version 0.2.2.1
On itch.io it's similar to a one-time purchase of a specific version.
This means you can play the current free version and wait for the new version to go public. Or, support us financially and get early access to the new version.