There was a period for early backers on our Patreon to receive this reward, but in general this won't be the case D:
Viewing post in Pure Onyx - Alpha Release December 2023 comments
Assuming we do early access further along in development, which is likely, the game will be available at a single price from that point on. I certainly don't recommend purchasing every release if you'd prefer to wait for content to build up. Know that the funding certainly helps us though, as due to our pirate friends sabotaging our work and Patreon stonewalling us, I'm now paying $10-12k/mo out of pocket to develop the game, and working 80+ hour weeks at a loss ^-^.