I really liked exploring a big various world, and a soundtrack is very good!
On the other hand, save points a rarely, it is too often when you walk through 5-6 screens and then yet another stupid death comes, and then you walk 5 screens again and die again.
Save points every 2-5 screens would be fine.
I think the 2nd kitten shows a wrong symbol.
Also for me the hard mode machine is easier than normal.