That's a very interesting consideration, and actually one of the main concerns during the design of the game.
During development I changed and tweaked countless times the levels and the endless mode to address this problem in the best way. Turns out it is however there for the "long term", it was a risk I wanted to take.
Personally I'm concerned too, but at the same time I'm intrigued on how the design "principles" for this console will evolve, and can't wait to see what people (and myself if I will do another game for Playdate) have in store.
Thanks a lot for your comment and for the feedback!