Appears to be a worse Vanguard Monsters with ads. Vanguard Monsters is pretty great, though, so it's not a bad space to try and build something in. I don't get how the purple guy is a llama, but the rest of the designs are at least okay. I would recommend noting in the description which features are things you hope to add in the future and which currently exist; there is no significant inventory management in this game currently, for example, let alone mid-battle management with effects.
I would also recommend not doing difficulty the way you are currently; I beat the first mission, then could not possibly ever make progress thereafter as the second mission is all but garunteed to have ranged attackers that kill my guys before they can move appreciably no matter how many times I restart, due to my not having any ranged attackers unlocked and ranged attackers being incomprably better than melee. Also I have 1 guy and they get 3, so there's that too.