Others have expressed difficulty with the hidden mouse, and I agree with them. I found myself moving the mouse out of the game window to briefly see precisely where it would be. I read people saying it may be just be user preference, but the way I see it, almost nobody would complain about seeing the mouse, but clearly some are complaining about the hidden mouse. Just speculation though.
Another thing I would adjust is to make the trail from the previous attempt persist to the current, so you have an idea of how to adjust from attempt to attempt.. This might even remove the need for a shown mouse too...
Enough of subjective criticism, though... this game is fantastic! By far the best I've seen in this jam so far, and is incredibly polished in all the important areas. Hard to believe a game this quality could be from the same jam as my entry XD