Very short indeed! Remember, you have all week to polish this game. :-)
One thing that frustrated me was not being able to find the exits/entrances to each tile - I had to walk along the edge to find them. Perhaps consider a way to denote these?
The music stopped immediately after exiting the first tile. Not sure whether this was intentional or not.
Not bad, but it is a bit unclear as to your objective in the game. I got to the end and was surprised when I was told that it was the end. Add some story and puzzle elements - what is your character trying to do? Why are they there?
There’s potential here though, I’m hoping you expand the game a bit. :-) Good job with your first attempt to use Bitsy!