Unlike super hexagon, the area is able to close in around you faster than the arrow will move. It is annoying more than anything. A fix would be nice. Also there seems to be an occasional studder in the level while building multiple similar walls consecutively. A bit more tweaking and it may be like super hexagon still.
 "Bloons TD 5"){kind=icon}
 "Idle Village"){kind=icon}
 "Hexagon"){kind=icon}
 "Vector Stunt Mobile"){kind=icon}
 "You Are The Road - Molyjam 2012"){kind=icon}