The two stages with the snakes I played were nice.
The stages with the spiders are almost unplayable. The reason is that the spiders are killing you, even if you are on a neighbour tile. Aside from that, even if this was not the case, the spiders move to the tiles where the keys were.
This made the second stage extremely difficult to pass.
There is also another issue, the keys are not too responsive. Seems to me that there is a timer in there which counts some frames before the move happens. In other words, simple fast clicks of the buttons do not work.
This made the second stage a real frustration and actually the reason I had no desire to play again.