I'll probably get rid of the compass gimmick in the beginning. I thought it would be fun, and that most people would naturally look where the original Level 1 is as part of places to start exploring.
As for Lv2, I've played New Quest, but not following what you're saying about the power curve idea.
Level 3 actually had a couple of more blue wizzrobes and I took them out cause I thought it was a little too difficult XD.
I will try to make a fix to Level 4. Keys are only 80 rupees in the shop so you don't need to go to Level 5 to get one, but I'll find a way to fix that.
The Whistle is not in Level 5. If you are referring to the room with the block and the single blue tile, there is another room that gives a hint as to what to do there.
Spoiler: show
Edit: reuploaded, swapped the boss key location with another key in Level 4 hopefully fixing the running out of keys problem. Also put the wooden sword on the origin screen,