Really fun puzzle game! Can see myself playing this for a really long time (took me a long time anyway haha!). Everything worked super well for me, it was fun and the puzzles were very well designed. Really hope y'all continue to work on it!
Minor critical feedback notes:
-SFX seems relatively loud to the music, definitely fine since you can adjust it, just might want to tune the defaults a bit.
-Sometimes I found myself forgetting my last moves if the shadows were overlapping or I was covering them, so there were a lot of scenarios where I would just reset myself or move back, stuff like that to try again. Maybe my attention span is just short lol. Not sure if there would be a good way to handle the overlaps with the shadows... and not sure if having another piece of UI to show the last 5 moves (in the current order) would be too redundant... maybe a problem to explore more? Not really a big deal, just sharing what it felt like for me.
-Maybe some quality of life thing to add would be an in-game list of the techniques (and their types) would be good to add. Once you memorize them you're good, of course, and there is a bit of fun to doing that, so maybe something to test out, not sure what's better.
Awesome job!