I've should done my research first and notice that you were a group of students from Future Games and not seeing that from the end credit. But hey, sometimes we just miss things. Not that it is bad or anything but it feels like so many talented programmers and designers can be found at Future Games and with Echo you prove you have the talent for making games in the future.
The choice of style for the game fits perfectly. It feels you manage to create this dream world you were going for in Mira's mind. I can see why a game like little nightmare would be a good inspiration for this.
A story that getting unfold while you moving forward, good. At first I didn't get it, but the more to the end it made it all more clear and it is a good and sad story.
Having that shadow figure around is a cool idea for a gameplay and makes up for a interesting puzzle solving. Sure some of the problems here weren't to hard to figure out but it leaves alot of ideas how to create good puzzle for later games with a similar style and gameplay.
Echo is a fun and amazing to look at game. Sharpen you skills and you will be able to make even more amazing games in the future.