I actually meant to say lvl 7, the one that is just a 4x5 rectangle with a lot of pads, not sure why I said 3 (maybe the third to last?); I felt like this was the hardest level in the game, as I always thought that one of the solving moves would kill me, but was instead the solution, whereas I did die a few times on the last level, but I ended up figuring it out quite quickly. I think that otherwise the difficulty scaling works pretty well, its just that the last few levels seem a little misaligned
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My first thought to mitigating this would be to ask some friends beforehand if they could playtest a version of your game without all the polished stuff just to see how the level design and difficulty curve are. Of course this is easier to say than to do, but I think its worth a shot in the future :)