Out of the two options I would prefer the first choice, most people got stuck on the first part and stop playing so a gentler difficulty curve would definitely help get more people hooked on the game.
At most maybe the game might benefit from a tutorial level but i think that what makes Foddian game like this fun is how punishing it can be. I don't think there should be various levels with different difficulties rather one main level and one main leader board. It would be interesting if there is different stages at different heights that follow a unique theme and maybe some disco voice lines that play the first time you reach or fall from certain spots, maybe something like "you might fall but, disco never dies".
The practice mode really helped me beat the game and I think it would have taken me much longer to complete the game without it. I also really enjoyed the "spin to win" section as well as some of the ice mechanics.
Overall I this is my favorite game this game jam, 10/10!