I liked it!
Nice graphics, story and mechanics!

Excellent work, definitely a great take on the theme. I'm sorry to all the fish I killed in my first run 🙏

Really fun game ! The visuals of thr game are nice !

The key to win is to pay more attention to your subs. They are your main resources generator. This is a simple yet addictive game. It needs more stages and enemy variety though. 

The first stage could start with half of the upgradable and more ugradable added for the next stages along with the harder enemies. And you should absolutely reset the progress for the next stage every time.

Also, I think it could be better if there are huge text saying "Enemy swarm/wave detected, brace yourself" or something like that. I learned that the anticipation is more satisfying than actual event.

Verdict : A very good tower defense game and it surprisingly is well balanced despite it was just created in 7 days. Very good submission, i absolutely love it!

The game is really fun and not too difficult.  The art style is nice and simple too. Good job!

I loved how well-polished the game is, despite its simple gameplay.