Yeah, the difficulty can be sort of all over the place unfortunately. The block spawning does speed up as you go higher, but it's definitely possible (probable) that all of that could use more balancing. I would have also liked to change the frequency with which you get certain block shapes too, which I think would have also helped (for example, getting a bunch of the one little block can make a run nearly impossible).
Glad you enjoyed it anyway! Thanks so much for taking the time to play and leave feedback!