By downloading the Itch desktop app, you can install older versions :) You'll have to install the game, and then go to the game page, inside Itch (https://fishlicka.itch.io/juice-galaxy) and click the cogwheel in lower right, and then "Manage" and then there's a button to switch to another version :)
Viewing post in Older Juice Galaxy versions
Heya! I can't make a video right now but hopefully these instructions will help.
1. First make sure you have the itch.io app:
Download App - itch.io
2. Open the app and log into your Itch.io account
3. Use the search bar in top left to find and install Juice Galaxy
4. After install, go to the Library tab and click on Juice Galaxy
The cog should show up in the bottom right. Alternatively, you can just right-click the game and then click 'Manage'.
5. Click the red 'Manage' button
6. Click 'Switch to another version...'
And there you should find your options. Best of luck, let me know if you need more help. I'll try and make a video on this in the future.