Gonna be honest, as far as the game goes, I think this is the perfect balance. Only things I could suggest are a Free Mode where you don't have to worry at all, and an Endless Mode where you try to go as many rounds as you can before getting caught, rather than just the set number of rounds in the story. (Maybe Endless Mode could use the 3 lives counter that seems to not do anything at all in the base game?)
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Gonna be 100% real, I have no idea, I was just throwing stuff out there. The Endless Mode is the one I'd actually suggest, though. But, that said, Free Mode could just be a reward for getting a specific score in Endless Mode or something, you could just treat it like a more interactive unlockable gallery. Idk, I'm just spitting ideas because I really like the game. lol