Dunes (Pikachurin)
About
Dunes is a puzzle game based on the mathematical concept of sandpiles, but don't worry it's simple and you can always read the tutorial.
The game will try to save your progress automatically. But if it fails tou can use the password system regain your progress.
The is built with HTML and can be played on the browser, but I didn't check for compatibility on all browsers and the game wasn't planned for mobile, so it will look weird on mobile screens.