Let's come up with an amphibian race!

..1. Triton – Agile Triton (attack increases with numbers – dodges thanks to agility);
..2. Turtle – Giant Turtle (can avoid damage by retracting into its shell – 30% reduced vulnerability to attack magic);
..3. Spider – Sea Spider (poisonous shot, entangles – entangles at a distance);
..4. Crocodile – Killer Alligator (main weapon – teeth, has a chance to bite opponents of levels 1-4 in half (the number of creatures in the stack is reduced by half), deals double damage to other creatures compared to normal);
..5. Neptune – Neptune Hunter (throws tridents, casts a random spell);
..6. Kraken – King of Octopuses (attacks everyone around without retaliation – entangles);
..7. Something – Mystery of the Sea (teleport, after death becomes a whirlpool);

In general, this is my opinion:
1) Triton: Does the attack increase with the number of units? And what is the initial attack value, and by how much does it increase? Will it be able to dodge in the sense of mitigating damage, or is it like a clone? If it's like a clone, then these two abilities are incompatible for the first level (it's too strong).
2) Turtle: And again, it can avoid damage and also has resistance to magic. It's unclear whether it completely avoids damage or only partially.
3) Spider: Also, very strong abilities, and again, it's unclear how it entangles. So, it entangles you, and then what? Will you miss a turn, will your initiative decrease, or will your speed be reduced?
4) Crocodile: This is just a killer. Have you thought about the chance of biting? Because you could take crocodiles, divide them, have a weak hero attack a companion, bite everyone, and then finish them off with the main force.
5) Neptune: It casts a random spell, and what level is it? Any level? And can you see what spell it will cast? Because it might be Armageddon, and then why would they even move. In short, he's a god of the seas, even though he's level 5.
6) Kraken: This is a good idea.
7) Something: Well, it's not bad for a level 7 creature.
Conclusion:
Guys, when you were creating this race, was the goal to make it perfect in terms of warfare and then conquer the world of Heroes? Look at the creatures: some dodge, others block, others bind, poison, bite, entangle, and Krakens don't get retaliated against. And how are you supposed to defeat them? And with the Water Wall ability, you can't even get close to them.
In general, refine the abilities, come up with creature characteristics, decide on the population, and then you can see what kind of race you have. Right now, you're only halfway there.

P.S. This is my view on the playability of this race, but if you consider its creation in general, then it's a bold step, WELL DONE!!!
GOOD LUCK!!!