This game is really good!
Visuals are really cool, everything feels consistent, cohesive and colorful. Animations work really well in every character. Music fits well to the game's pace. Controls are responsive and intuitive. The experience is so satisfactory because it's full of juice and effects. The upgrade system is so clever and allows the player to create a strategy, every try feels different to the last thanks to that.
In my experience, this game was flawless, you did an excelent work and created something really enjoyable. You can keep building on this idea adding more and more of what you currently have and the results would be incredible.