I liked this a lot! Impressive to be done in two days.  It felt different from a lot of the stuff that you make. I didn't actually read much of any of the text - in this kind of puzzle game, I just want mechanics, but didn't mind that it was there.  Agreed with the post-mortem the difficulty was too easy, but I see potential for more complex puzzles with these same tools down the road, with more time. (Check out Stephen Lavelle's Gestalt_OS game which is similar concept with the difficulty turned up 1000%.  Ideal difficulty would be somewhere in the middle.)  Bonus polish features that would be nice is a "Next puzzle" button and a display to say what puzzle you are currently on.  I enjoy your postmortems.

Notes as I played:

4.3 -- the first one where I'm like - oh, huh, let me think about this.  Slightly sad it's just a mirror image so once you've done it once, you need to repeat it. (edit: until I fucked it up on the mirror image side even when I knew what I needed to do so maybe that was interesting).

4.6 -- solved once trivially, and then accidentally clicked it again without realizing I clicked it again and solved it a second time slightly differently that was less trivial.  I thought it was a variation on the first puzzle until I realized it was the same one. [Interface niggle - the red/green colouring make it look like the green puzzles are the ones you've unlocked (as is typical progression in this kind of puzzle game), so I keep clicking the last green one in the menu instead of the first red one.]

5.2 -- first stumper, took a few tries to think through.

5.5, 5.6 -- appreciate that it's not symmetric.

6.4 -- another thinker.

6.6 -- got stuck on and skipped to come back later (appreciate the ability to do so).  Then got stuck on it again.  This is weirdly way way harder than all the other levels.   I guess there are seven things you need to click on, in any order (two of which you need to click twice), which means somewhere on the order of 100,000 possible solutions.  I never felt the need for an undo button except on this level.  Still stuck here with one puzzle unsolved. 

7.1 (and a couple other levels) -- slight bug, if you click the key while an arrow is still animating, it still counts as "on the board" and the key doesn't work as expected.

7.4 -- Ah ha! I was wondering when if we'd get to rotators that move rotators.  Good one.

3.6, 4.5, 5.4 were other puzzles I noted as interesting.