I think I know what happened! The unlocking of the level only occurs after the counting is done and the "Click hereto continue" button should be disabled until that. But the button was active in all levels and you probably clicked "next" before the count was over! lol
I disabled the button and now it should always unlock correctly!
I'll add the new build soon, I'll add some other fixes and upload proper MAC and Linux builds!
Thank you very much!
Cheers!