Didn't have any trouble with the puzzles, they were pretty easy to me. The fizzler in the 2-stone-block room might be worth removing to avoid frustration, though...

I agree with Chacham's point on the doors. They had the potential to become an interesting puzzle element, but right now they don't add anything but a bit of timing.

To make the door visuals less annoying, you can turn off the trigger sparks by unchecking 'allow link feedback' in the editor. ;)

Relies on timing. If you mess up, when you finally realize it, you have to do everything over. I had this probablem the first time because i did the three memory block backwards. Not because i wanted to, but because that is how it seemed to me. After i did the third room (first memory block), i realized the sand block had to be preserved.

The constant opening and closing is annoying and serves no real purpose. The noise and visuals are distracting.

That said, all the puzzles are decent. I just think it needs to be more intuitive.