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Yes, the challenge of survival increases a lot as the levels change. Look, since you're the developer of this game, I'll tell you that if you could change the color of these green balls when you progress from one level to another, the game would be more fun to play. Or if you added tokens that double the fire rate of the canon, like the freezing tokens that the game drops, it would bring more innovation to the game.

Thank you for the feedback and suggestions. Some of that is already in list to do. For now we are aiming to get the game out and integerated with the blockchain aspects of things. Once it's playable with rewards and leaderboards, we plan to enhance gameplay with the suggestions you mentioned and add new types of power ups and levels.