Over the last couple of weeks I've been uploading the demo and here's all that's new since the 0.2 patch notes:
demo ver. 0.3.0 save system
new
added a save button in the settings menu,
game auto saves every 2 minutes
demo ver. 0.4.0 achievements
new
Achievements tab in the Collection Menu,
Fish now react with hearts when fed,
Character customization button in the Main Menu,
balance
The Crystal Clear Upgrade rewards with more Jar space than before,
known issues
the Character customization doesn't save the character between different play sessions
demo ver. 0.5.0 QoL improvements
new
added more feedback when feeding fish.
added button to change the game window (top of screen or bottom), and option to change the offset in settings
added pin button to the Your Aquarium fish cards so that you can favorite fish and avoid selling them by mistake
added (finally) the fish state of each fish (their food and coin production progress) to the save system
added a Credits tab in the Settings Menu
fixes
fixed fish over eating when multiple food pieces are nearby