I had a playtester who really struggled and the change to make buying more time cheaper was one of the last balance changes I made. In hindsight I think I overcorrected, as several people have pointed out the same issue. Live and learn! I'm glad it didn't detract from your enjoyment, and if you want to up the challenge, try to get all the acorns - I put an easter egg in for getting them all that I don't think anyone else but me has achieved yet!