It started out slow, but the game really picked up on the later days. I like how you get access to more fishing spots and more towers, the progression was actually pretty well tuned. My biggest issue was that sometimes building more towers was counter intuitive since they would shoot at an enemy they couldn't hit, wasting my fish. I wish there was an option to temporarily disable them, mostly for the shorter range towers. The actual mechanics were really impressive though. Apart from some UI jank, building the towers (and the fact that enemies would attack them?!?) worked great.
I also found a bug that you can click after the fishing is over/while it ends to get a bunch more fish.