This was cute! I wish there was a bit more of an explanation o what to do though, if not in the game then at least in the game's description. I spent a long time standing in front of the first button mashing buttons on my keyboard until I found the right one.
And yeah, level design can really suck up a lot of time, especially for these types of games where the levels themselves are where most of the complexity comes from. It feels like some of the levels are only beatable if the player already knows which ways are dead ends, which feels kind of bad (Especially when the game kicks you back to the first level each time). Not sure how to fix this though outside of spacing out the safe zones in a specific way.
Overall, great job!