Is there a time limit to finish the levels?
The entire game is quite, quite like a simpler version of Spelunky. Just as in Spelunky, you have ghosts chase you after the clock runs down.
Spelunky's is 5mins but this one I'm not sure. I'd need to have it run out once but especially earlier on it's a non-challenge to be finished well before then (unlike Spelunky which is more random in levels).