Solid idea and I think it's framed well!
Unfortunately the enemies often come in unavoidable triplets across the screen before you have a chance to get any fish... maybe if we started with some fish off the bat it could have mitigated that some?
The fish were also sort of unintuitive as a whole, I didn't understand when I got them at first, since the logic of ramp -> fish is kinda random. I think maybe it would have been better to just have fish pickups, as boring as that would be.
It was doubly confusing because the animation on the ramp sort of reads like you're spinning out of control, so it seems like a bad thing... ESPECIALLY so because the bar goes from what looks like full to empty, so you think you've just taken damage or something. I'm assuming that was your fish stock, so maybe it would have made sense to have fish icons there as well rather than a continuous bar?
Also I think the moving particles effect was pretty cool. I don't know if it's supposed to be the ground, but if it is it's moving twice as fast as the enemies that are also on the ground 😅
I think all the art was nice! The penguin skis worked especially well for me, its cute lol.
I know this was a lot of nitpicky feedback but I DID enjoy the game a lot, once you get going with a nice stock of fish I think the game is really fun!