This was a fun and challenging game! I love the moody atmosphere in the swamp backgrounds, rolling fog and accompanying soundtrack. It all melds together for a chill experience.
The atmosphere compliments the difficult challenge too. Perhaps a little too challenging in some levels though. The first levels were a little tricky to start off from. I also think there should've been more thought into the flow of introducing mechanics and the difficulty curve. For instance, after introducing the portal mechanic, the next level doesn't use it? Strange time to introduce it.
However, the core gameplay is fun and addictive, and the controls are tight and response. Like other commenters have said though, increasing the range of tongue could help reduce the frustration. Good job to the dev team!