First of all, thank you for making such a unique game, I enjoyed it really. The unbalanced difficulty was concerning the huge arena, yes. When you have platforming like this, you just have to start with basics and then expand on the idea and make it more difficult, it's just how games work, nobody wants to be thrown at something huge in the beginning, but, that's just subjective, I guess. The best part of the game is the platforming and overall idea.
It's just my opinion, but maybe you can make something harder, even more and let this "part" of the game be in the middle, like something simple, then this and in the end even more difficult. It's your choice and your game. Thanks again for creating it, I really had fun!