This was interesting and pretty unique: as others people said, it reminds me of Getting Over It but the snake theme and movement make it different. I had a problem that nobody seems to have; most of the times the tongue gets stuck even if i release the left click button (as if I was holdin it), and this stopped me from completing the game, and I would have finished it for sure. I'd suggest some slimy sfx and maybe a more theme fitting ending for the level instead of a portal (i dunno, a mouse to eat?)
Good job overall, I enjoyed this!