Hi there ! Like the concept and I guess there are some tiny things that could improve the overall experience.
As it was already said, the game feels slow at times. If a feature of accelerating the throw could be a lead, I thing selecting the number of time the dice is thrown could also greatly reduce the wait especially at the beginning when we only have one dice to throw.
I've also noticed something on a monster who had a passive that deals 2 damage when you attack. The icon is barely visible at first but also is quite distant from the monster itself (way up from the monster's sprite). It didn't feel intuitive at first that it was 1) a passive and 2) related to the monster inside.
Also, I think there is a typo for the butterflies with their flame attack that makes them gain strengh. It is written "strenght" in here :o
Overall great concept :)