Apart from the great look and feel of this game I liked how naturally the game pushes the player to think about how the tuning works. The level design is so good at teaching new concepts that it almost felt a bit easy. The best way I can put it is that this game looks very professional somehow.
The tuning is rather slow [Spoilers from here on] and hard to use precisely when the game starts using the tuning for time-critical things. Using the tuning for actions where precise timing is necessary also clashes with how the transition is smooth and the exact point in time where the new rules apply is not obvious. I ended up modifying the game to make tuning faster to be able to play more of the game but quit after a few levels where tuning during a jump was necessary. I think there was a bit too much repetition in those levels. (I just checked theby rearranged the levels in the source. Looks like I quit in the last level.)
Maybe these problems could be sidestepped by having the player switch channels instead of tuning a frequency?