This is actually great. I instantly had a fun just playing a tune, rapidly rearranging the chords and move over to strum, back and forth. It really surprized me that's workable.
Would sugggest maybe including the alternative F Major chord.
A way you could really elevate this; would be to have some kind of feedback as correct ( or incorrect) strings are played. Which would make the chords far more easily discoverable.
I think this could be a fantastic learning aid.