Now I have finally had time to play your game and I am absolutely blown away by how complex it turned out. I would not even know how to manipulate the background tiles to show the correct cards and somehow even managed to teach five different levels of AI how to to play the game with different skill levels. Also the tutorial was very easy to follow and understand. This is just amazing! And with the randomization of drawn cards, this game has almost infinite replay value. The only thing I was kind of missing was different sound effects for different amounts of points gained so that the high fusioned cards sound more rewarding than the regular ones. Other than that the game is perfect in my opinion.
Thanks so much for your comment, it means especially much from someone who's game I really admire.
Regarding sound effects, I added them on the last day and they could be much better, I think. This is one of the points I want to tackle whenever my energy has refilled a little more. Thanks for the suggestion with the points, I hadn't thought of that before. :)