The game „Millie“ reminds me of the same basic concept as the classic game „Snake“ has. With eating / collecting pellets your body grows and you have to take care that you don’t colide with yourself.
In Millie you play a cute colorful millipede which is detailed designed. Also the music and comic influences are in a cute childish style.
The aim in Millie is to get all pellets (+ maybe upgrades) and to get her to aviation school so that she can become a pilot. But the story does not match the gameplay. It’s more something additionally.
The upgrades in the game can help you in different ways, for example making the body of Millie shorter again or destroying walls. So you should better collect them.
With finishing levels you also unlock minigames which are really challenging if you want to get good playing times and always full rewards.
But in general I think this game is just something for boring times in between. I don’t regret that I bought this classic game for such a cheap price and I think I will play it from time to time.