Thank you very much for playing. Yeah, we haven't done any playtesting on people outside the team, because of lack of time. It is basically a crime for a game like this. The cells uder the program steps lite up as well as the board, but it's hard to notice.
You've already moved on, but it works as follows. The INV block changes direction of the command to the opposite. Blocks on the commmand cells do this on the specific turn. Blocks on the board work on the turns, in wich robot is on this tile.
Gonna go and write a tutorial in the description, maybe it'll help.