It's not bad, the player has to be extremely sneaky with pin-point precision. Most of the begginer levels could have been in the middle of the game, to teach the players properly the mechanics.
Yeah, the difficulty curve is the biggest thing that I wish I had time to get to. Out of curiousity, what mechanics did you struggle with? I'd like to add more introduction for new versions of the game (after the jam is over of course).