I'm not entirely sure what I'm building for, and the pieces not being able to rotate outside the bounding box makes sense but is frustrating to try and control. It didn't feel like there was enough time to fit the piece, so needing to maneuver it more just to rotate it is simply frustrating, because the piece won't fit either way.
However the game runs pretty smoothly and anything that I could do does work, so props for that :) You can definitely build and add more to the game on top of this base mechanic, and tweak the controls a bit for a smoother experience later one. Great start