Had a great time with this! Really cute art of the multiple (also pretty) characters and nice bit of story to go along with the satisfaction of reaching a new stage. I found it short and sweet as a whole.
The main thing that would've felt better was if there were some music and sound effects for the gameplay, expansions, and cutscenes.
Took a while to get through stage 1, but middle stages felt better paced and it was nice seeing new elements introduced to lower any repetitive feel.
I do wish we knew more about some of the skill point benefits. Like how much a crit added, when one occurred (a sound effect especially), or what luck affects. Although that vagueness fits given the contextual mobile game.
Awesome work overall! Too bad it's not a real app...