Amazing level! I loved it.
For me difficulty itself was solid, but lack of save spots at some points had to be compensated with cheat-saving.
Here's a list of screens lacking a save spot at their beginning: x1014y1028, x1015y1028, x1024y1028, x1026y1028, x1030y1020, x1006y1028 (around x15), x1004y1024.
Also, auto-save shifts are a bad idea, there's no reason to use them instead of proper save spots (if it's for aesthetics, you could use custom graphics either with press-down-to-trigger shifts plus graphics or with customized save spots if KS+ allows it).
E.g. despite linear nature of the level I did trigger an unwanded save when I jumped left from that mountain to see if there are any secrets.
Speaking of aesthetics+function, the mole holes are a great idea!
There's void to the left of x1008y1011 and wallswims in the attached screenshots.
Also, incorrect difficulty (2 difficulties are only for levels where you can choose between them) and more importantly incorrect topic title (lacking [KS+], which means one has to first install it in KS Ex, then find out it's for KS+, then delete it from KS Ex, then install in KS+).