a team in NTNU has been making a simple game to play around with matrices; the app is here: https://jesper2k.github.io/SkewX/
If you feel like investing 10 mins of your life to test your intuitions behind matrices, try the '10 hard questions' for some 5 mins! And if you want to help the developers, may you also go through the survey? (ca. 3 min): https://forms.gle/Wivk4cWZ4ZnvrYZ37
Thanks