Out of curiosity, what sounds exciting about a free mode? I feel like it's just a gallery at that point.
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