I really like the fact that enemies are getting stronger together and not you ! Not many games do that :)
It is really fun to play, you can come up with strategies, having to try to put yourself in danger to see how well you can perform and need to be smart to avoid the angry fishes, or just try to eat one fish at a time and keep big swarms close so you do not starve to death.
Also the controls are really simple and feel nice.
And the low poly style is quite good :)
To give you what I thought could be improved:
- Add music and sound
- Showing the best score somewhere so you don't have to die to see it, for convenience :)
- Sometimes if you eat multiple fishes at the same time, some might be able to bite you back even if they were swallowed.
Nice work