Loved it! (So did my toddler, she told the cat sorry every time it died.) Finished all the levels; took a while to wrap my head around what was happening with merging the walls together. Not sure how, but i think that could have been made more clear.
I do have to give you the highest of praise for the first few levels though! there was no text at all that told me "The walls can be pushed." or "They will stick together this way." you just built the level where the player was required to learn it themselves EXCELLENT design work!