There isn't a limited time to complete the levels, but there is a wall of fire creeping up from the left, the level resets if you get hit.
The installation is bugged for some people, that might be my bad, did you unzip the file or did u ran it from the zip file? I'm not sure why it's bugging out for some installations ill try to fix the download bug in the future, but sorry for the inconvenience, my guess is that the wall of fire had become invisible which is not good obviously.