I had the same issue :<
The game was a bit long, too, so I didn't want to restart even though I really wanted to finish it. It would have nice to have a restart button. Otherwise, I was going to say, would love to see more of this!
Haha the concept for this is amazing. Very fun, played all the way through even though it was really tough. I was really getting the hang of it at the end and definitely was going to play through to the end no matter how many levels there were. Thought I was going to be playing a lot more games tonight but spent most of an hour with this.
Played it all the way through and got 15/14? keys? Maybe one day I'll become the best.
Great use of sound as a player aid, and while I don't think that the memory based mechanics would make a full length game in itself, they could definitely make a very memorable dungeon in a Zelda-esque game. Very well polished, too!