Thank you for playing my game.. sorry about the issue of getting further into the game.
I'm a little worried it might be a bug though, this is how it behaves for me.
After I complete the tutorial...
There is a cracked block in the bottom left, with a number 1 above it. (I've added the red line in a screenshot.)
I can then break the block (jump + down) to fall into the first level.
Would you be able to check if this isn't the case for you? If so, it's a game breaking bug I'll need to fix. Thanks heaps.