Nice gameplay... But the style is too boring. Use more colours. Replace the grey. Add animations at the end of the level. This can be a great game... You should only to restyle it ! ;) I follow!
The game is nice. i played only the first levels. But the tutorials are too long ! The gamer doesn't want to read so much ! My suggest is to add a very easy levels in the first part. So the gamer can learn playing :)