That first level "Metal Gear Liquid 3: Snake Feeder" was pretty gnarly, ngl. But it was doable after a couple of hours at hammering away. My one hint to players struggling is to notice that the snake will always take a step towards a shortest path to where you land after you move. So if you want them to take a specific path, consider where the snake and you have to be placed for that decision to be a shortest path. Figuring out the routes you can take to maintain your gap with the snake and increasing it with the apples is pretty much key. There are a couple other brain blast moments, and out of the box thinking, but I will not spoil the fun.
I also really enjoyed the two fish levels at the end. Really awesome game guys!