This game has a whole lot of heart put into it - it's got basically the same premise as Tiny Fishing on Coolmath, but all these extra fun bits like the fish chasing you, the music and the fish chasing sound effects that blend perfectly into it, and the achievements you get for specific things (plus the fact that there's an actual end goal) improve a ton upon that concept!
Perhaps it might be better to include something more to measure your progress overall, beyond the upgrades, medals, and distance? Maybe a fraction or percentage of how far you've gotten over the total distance (which I see is 1000)? I think that if there's a clearer indication of progress, there'll be more motivation to continue dodging those vicious attack fish.
Edit: Also, please make this mobile compatible! I really want to play it on my phone too!