Sand Castle – Prelude is an interesting physics based puzzle game where you use the power of sand to unlock doors. In order to do that each level offers you some different tools… mostly scales but also gravity fields and other things. An overall nice and relaxing game with fine acoustic music.
Info:
The developers are currently working on a sequel which will be commercial.
Link to Trailer (by Developer)
Link to Gameplay Video [Walkthrough Level 1-8 // Part 1 of 2] (Pixel Prospector)
Link to Gameplay Video [Walkthrough Level 9-15 // Part 2 of 2] (Pixel Prospector)