Thank you for the feedback! I do think a more clear timer indicator would've been nice.
As for the level you are stuck on...there's only a single level where you are left with only a single key and that one doesn't have any gates in it. Just to be certain, do you know that what used to be the directional keys and function keys can be re-mapped to each other and vice versa? If all else fails it could have been a rare bug that we let slip by! Restarting the level "should" return things to intended.