Hello, this is an awesome start for your first ever game! The game flows well without many bugs and it's easy to learn. I also loved the UI and hand hopping theme of the game.
Some possible points of improvement:
1. Avoid impossible scenarios where the player has no way to not die (sometimes the obstacles come in such a way where the player has no choice but to get hit)
2. Animate as much as you can! Player hit animation, lane swap animation, UI animations, animations when the obstacles spawn, coin pick up animation, etc. They don't need to be massive animations, just simple animations that are enough to provide feedback to the player about their actions.
3. Consider using a tweening library to animate your UI (eg LeanTween). It would give your UI a lot more liveliness.
4. A bit more advanced but consider using lighting to make your game look more vibrant. Unity comes with a package called URP which is awesome for that (Brackeys has a bunch of tutorials on it).
Great job once again!