Loving the game! Wife created the artwork and it feels pretty cool to get to play what I heard y'all discussing and seeing it grow. Great job guys!
I'd like to be able to use the Q and E keys to swap between characters that way players don't have to rotate through all of them.
Only other thing I'd recommend is making the gem icons that need to be found a bit smaller. I felt they were taking up too much real estate.
The color/element puzzles are really great! I love combining and swapping characters all over each level.