Viability: Cute, simple and fun. It def needs some graphics to really sell this game, but otherwise I think it's cute. One other thing to think about is how those moving platforms are timed. They feel a little hard to interact with at points.
Presentation: I like the idea of a little character that follows you around. Makes the world feel a little more alive. Def needs those graphics though!
Theme: Right now a bit hard to make out from the visuals, but it seems calm and fun. I'm not in a terrible rush and that feels good. I'm focused on keeping the little guy safe. and getting those ORBS.
Engagement: I'm loving this little dude. Do it for little cube!