The physics were indeed a bit annoying (especially the sticky walls) but I did enjoy hooking onto terrain using my merged boxes and the puzzles were overall designed well. It would be kind of annoying at times if you messed up a box merge late into a level since you'd have to restart the level but the levels weren't long enough for that to be much of an issue.
On a more personal note the game was maybe a bit too blue in that when I got to this rating page my eyes took a second to adjust.