Hehe, thanks for the suggestions, @obilly, I really appreciate when people dig into details and try to understand the plot!
That might sound as an excuse, but for me the time limitation, my lack of skills and knowledge made me cut a lot of the initial idea I had for this one... Which why there is no explanation on "was the casino plays successful or not", "why Pambo had to fight", "what/who/why is the enemy" and many others. And I'm sorry for that, but at least I managed to show some mechanics I imagined, brought somewhat complete game(with a start and end and something in between XD)!
So the initial idea was that Pambo is like a combat-experienced penguin, like a Rambo, but since he is a penguin - Pambo. He is retired and living his life. Once he decided to gamble a bit, and lost all of his money, so he had to get back on the fighting path. And the Orca supposed to help him on the start, appear a couple of times along the game and finally become his enemy, who watched Pambo and learn his patterns to counter them in the final fight(simple approach, just aggregate the amount of jumps, gravity spins and world spins, count them along with the preferred weapon use(yes, there was some more weapons, but again, lack of time and skills...) and based on that use some different final boss combat patterns). This is why Echo Nemesis - he echoes the Pambo's moves and counters them.
But well, since I'm new, even the arts took me a while to make, that's why I had to cut a lot of the story off and just post what I had...
Anyway, thanks for playing the game, for such a detailed review and suggestions, really appreciate that!
Cheers!