I know it's a pretty simple project, this is my first time using logic gates, but I wanted to share this. I made a 5-bit countdown in which you can set the initial number (0-31) and, as an output, get the current time and a signal when the countdown is over. Finally, you can stop, resume and reset the timer any time you want.

Honestly, for me this is a very big project, all what I made is a 2025 RAM unit, so your project is quite good compared