I like the idea! It might be cool if Mausa's size changed more drastically, potentially taking up more than one tile at a time... And maybe the goal size could change as well? I liked the random effects in different levels, though it might be good to give the levels names/hints that identify these gimmicks in case it is not clear to some players. And I like how some levels were more about strategizing your movement while others were about going as fast as possible! Maybe Mausa could also gain different abilities/stats as he grows, too. There are a lot of ways you could develop this idea in the future!