Taiyaki is a packing puzzle with a cage and six pieces, part of a series of three packing puzzles released by Frederic in 2020. Six tetrominoes pack into a restricted cage; easier said than done!
Taiyaki also includes bonus symmetry challenges (see images), which will be packed along with the puzzle.
You can hear more from Puzzling Time (just discussion, no solutions shown!) in his video here: https://www.youtube.com/watch?v=wxsg3wh2Jqk
This puzzle was reproduced in PLA with permission from the designer.