Updates

There were multiple different alpha versions, 1.2 being the last uncut alpha version.

Fig update
The previously available alpha was replaced with a cut-down alpha demo at the start of the Fig campaign that successfully funded development of the full version.

Spoiler bubbles
Dark Bramble, Giant's Deep, the Hourglass Twins and the Quantum Moon were blocked off by huge bubbles covered with a warning message "Danger - spoilers ahead". Entering any bubble and not leaving it again within 5 seconds makes the sun explode instantly, killing the player within a few seconds.

Besides that, these planets appear to be unchanged compared to the previous full alpha.

There's no known way of bypassing the bubbles - using the probe is not an option either as it's strongly repelled. Of course it's possible to enter any such bubble at high speed for getting a short glimpse of the planet.

Sun Station
A Sun Station was added which was not present in the previous alpha version. It's much smaller than the one in the release version and seems to only consist of a single platform with a spiral-like structure underneath.