First game ever, awesome work! That alone is worth something for sure. Keep going with what you have learned and make some more small experiences like this.
For critique, the biggest issue is feedback to the player. When reeling in there is a solid color featureless floor, wandering fish, and undulating water; none of these provide any info to the player that the bobber is being reeled in. Something as small as turning the camera 180* towards the player and/or sculpting the floor could do wonders. I like the idea. The Nintendo Wii basically spent a whole console generation on "waggle to win" and you used it to make a fishing minigame! I don't mean that as a negative thing, just that you, on your first game ever, landed on an idea that clearly works.
Seriously, good work and keep going, make more games! I plan to and hopefully we'll cross paths again in the future.