Thank you for developing this game :) The online version does not work yet, I can not place the selected piece on the board.
Viewing post in Ada Lovelace: Consulting Mathematician (Digital) comments
The game works but the placement of the pieces is not obvious. You do not drag the pieces to the board. You first need to orient the piece correctly (i.e. flip and rotate). Next click on the board where you want to place the square with the circle. If the piece would fit, it will show up on the board in orange. You then push the confirm button and it locks in place.