Wow, very good hyper-casual game. I played on mobile and it works smoothly. BTW, why portrait/vertical orientation instead of landscape/horizonal? Seems horizontal would make more sense.
In swapping, I would prefer a clickable button so I just have to click once. A swap button at the bottom-right would be nice.
Great work on overall graphics and aesthetics. The music and sounds blends together perfectly. The game is polished well and looks done professionally. Well done.