Overall, a pretty solid little puzzle game.
I enjoyed the minimalistic presentation, though I do think that the ambient music would be more suited for a macabre atmospheric adventure than for a puzzle. The graphics, however, are pretty sweet in their simplicity.
The gameplay itself consists on moving multiple green squares simultaneously such that they end up overlapping and merging into a single one. Obstacles include solid walls, spikes and one-way gates. I can't say this is the most innovative concept ever, but it still made for a pretty enjoyable and mildly challenging little puzzle game.
I must confess, however, that the difficulty is rather sub-par considering that the game advertised itself as containing "hard levels", but well, it's still a pretty solid little game overall.