Thank you for taking the time to give such detailed feedback!
What I wanted to test with this first release was whether the basic battle loop and overall presentation were appealing enough to justify committing much more time to a complete deck-building and ability system. Since this is my first game and the current build is still a very early prototype, I deliberately kept its initial scope small instead of implementing every planned feature before knowing whether anyone would be interested in playing it.
That said, I understand your point that the current version does not give the player enough meaningful control. With fixed decks and only Miku having an ability, matches can depend too heavily on the total value of each deck, while keeping Miku alive may feel more dependent on the AI’s targeting than on the player’s decisions. That is exactly the kind of design problem I needed this initial feedback to reveal.
More characters, abilities, deck construction, and further improvements to the AI and balancing would therefore be the main priorities for a future version. Your comment has given me a much clearer idea of what the game needs in order to become genuinely more strategic and interesting.
Thank you again for your feedback explaining the issue!