I ran into a bug where part part of the beach was outside my screen, could not collect the last crab on lvl 4. I also felt like it was a bit random if the crabs moved to a place where i could catch them or not. I like the consept though. I think it could be fun coming up with stratiges to trap the crabs if they was a bit smarter. Like the music and sound effects. Here is a video of me playing: