Wonderfully designed game. The game play is fun, controls well and the changing levels keeps it challenging. The visuals are great too.  Whether you are playing on a small GBC screen or a last 1440p monitor they are crisp, easy to read and just plain beautiful.  A lot of work has gone into this and it is a steal at 1$    

If you want to play more games like this, support the developers, pitch in more if you can.