There are a lot of nice features in the manual building mode, and it’s actually pretty usable even on a phone sized-screen. That’s an achievement in itself It looks quite good too, the brick model and the minimalistic interface.
I found the ‘play’ mode baffling, but I suppose there might be people who it appeals to… in my view blind guessing isn’t much fun, and I think I’d prefer hints, or even just being told which part comes next. A meaningful act in a game has to be an informed one.