Robo is a WIP game intended to provide a full Sandbox feel, while providing an engaging and interesting storyline as a platformer as a sort of different feel to the genre. Robo has been in development a small amount of time. Because of this, only much of the back end of the programming has been done; it has to be implemented and made to run smoothly.
Tiles can be removed and placed very fast. In this picture, Robo is digging faster than he is falling. Of course, gravity will soon speed him up though.