Neat game. For a fairly common concept, it's been done very well and has a lot of good potential. I liked buying upgrades to delve deeper for more expensive fish, that's an excellent structure for a game like this to have.
I do feel like the art is a little inconsistent though, since there's a pixel font + smooth stylized fish and UFOs + a highly detailed background.
More alarmingly, hitting T while in the middle of the game completely resets your progress, which is what happened to me and was quite annoying since I had mostly upgraded everything.
Overall, it's a pretty good game! Just needs to be worked on more, I think.