Collecting "points" doesn't really make the game interesting because it looks like it's only a small bonus. So a small improvement could be making collecting more rewarding. Obvious way would be to increase the bonus by a lot more and really emphasise it with sound fx and added visual (humans are silly beings, we get excited by flashy things lol).
Another way would be to add a high score list but that's a maybe. I think you could take some ideas from Subway Surfers and have timed bonus abilities that make a huge a difference to your end points total.
One thing I did enjoy was the movement and dodging those whirlpools and rocks. A cool situation was trying to collect those "points" near rocks and "whirlpools", which added a bit of thrill to the game - collecting while not get hurt/damaged/stunned. Adding more moments like that would be increase the excitement of the game.
All in all, I enjoyed it! :)
Edit: I'm such a clown. I played this while muted lol! My point about the sound fx still goes though. For example, have the pitch of the sound increase a bit when you collect a coin within a small time frame.