The cards are a cool concept and I enjoyed the creativity involved in some of the solutions! I think it would be better to have less positions to place the cards though - most of the tile shown in any given level never seem to get used. The challenge to me seems to be more fun to think of as 'which cards should I use' rather than 'where should I place them'. The levels themselves are cleverly put together, but could do with scaling down a fair bit (instead of speeding up the robot?). Nice work though, this is definitely a fun mechanic!