Martin Kühnell

software developer

Hi there! I like C# and Unity. I've made websites, software and games. Check them out!


As I'm sure you can tell, graphic design is NOT my passion...


A program that makes it easy to download videos, audio, and thumbnails from YouTube, Twitter, Facebook, plus a LOT more supported websites.

Even if a website isn't officially supported, if you use the URL to the raw video stream (like an .m3u8 file), it might still work!

The program is a WPF Windows application, written in C#. It uses the CLI programs, yt-dlp and ffmpeg, behind the scenes to make downloading videos, with a lot of options, possible

Different formats are supported:

  • mp3
  • flac
  • opus
  • mp4
  • mkv
  • avi
  • png
  • jpg
  • ... and more!

And different video resolutions:

  • 2560
  • 1440
  • 1080
  • 720
  • 480

Made as a WPF Windows application

Geometry Battle

A game where you have to survive for as long as possible as a hexagon, being chased by triangles. Each time a triangle touches you you lose a side. When you are a triangle yourself, you lose!
You can teleport and slow down time to help you survive.


Made in Unity.

Dreams and Darkness

A mix of tower defense and bullet hell.

You control your own character on a map and have to stop hordes of enemies!

You can upgrade both your character and your towers. There is a variety of towers, upgrades and enemies. There is even a boss to make things extra challenging!


Made in Unity


A mobile game where you have to shoot a ball past obstacles to reach a goal.
With collectables and multiple ways to solve each level, the game has good replayability.


Made in Unity for Android phones.


A website I made to use as a shopping list. It's a progressive web app (PWA), and can be installed on smartphones to be used as an app.

After more than 4 years, it is still being used every day by myself and my family.

Made with ASP.NET and an MSSQL database.

Javascript, C#, Cookies, Password hashing