Impressive, Andy! Since the dev is checking out this thread, they might want to know that you can play locked nightmare levels by pressing ‘continue’ after finishing an unlocked nightmare level. Maybe just make it so that after beating a nightmare level you have to go back to the level select screen?
Nightmare... Whoa! Talking about nightmare levels, I've only unlocked one. This game is kinda hard and requires a lot of practice and patience. Ps: Reading your username insta-reminded me of this song: https://m.youtube.com/watch?v=bUBf92FF0bo
Hey, thanks for reporting this, we also found the same issue. It has since been fixed, but the update is not yet live on the app store yet.