Here is a technical demo of my open-source game. It lacks a menu and any settings, and the graphics are highly sketchy. My main goal was to test the idea of the gameplay.

Summary:

The blue plot displays a random analog signal. The light green plot displays the signal derived from the digital signal (see below) by passing it through an RC circuit.

The digital signal is generated by the user: when the mouse button is pressed, the signal level becomes logical high, when the mouse button is released, the signal level becomes logical low.

The goal of the game is to replicate the shape of the blue plot by the light green plot as close as possible.

See details on its page: https://thewizardplusplus.itch.io/pwm-simulator