I'd argue 2048 is only so addictive due to the numbers go up and a clear game vision.
You took an interesting take on trying to transport the merge mechanic into a completely different world, but that kinda breaks the immersion of 2048 merger gameplay. There are no numbers go up. Its not intuitive which products are mor valueable and create the next in the chain. For 2048 its 100% crystal clear due to our schooling system.
For your game its very though and even harder if you never watched the anime, I did and struggled hard too.
The sound design is very good though.