I'm glad you liked my game. I am planning on maybe making a full version as this is by far the best feedback I've ever gotten on a game jam (and I also really enjoy the game). A level editor is a good idea, I'll have to look into that.
I didn't want to limit the blocks as I wanted to give full control to the player to build whatever they want no matter the size, that's why I put bonus stars for beating the levels with a certain number of blocks.
Thanks you for playing my game! 😀