The presentation is great! The 2D artwork integrated really well into the 3D world, and I like the characterisation in the environment design, particularly the room you start in. Would have been even better if you could interact with some of the set dressing with your tongue e.g. switching tracks on the boombox, opening the wardrobe etc. The music sets the tone really well and the sound FX are well done too, just missing a licking/slurping sound for the tongue! I think the use of the 2D animatic cutaways for death was a great and novel way of injecting style into gameplay, the closest thing to it I could think of were the die-o-ramas in Crash Tag Team Racing.
Really the biggest shame is that your core mechanic seems to be bugged, as I think others have pointed out your jump scales with each jump you make, and in fact eating flies resets your jump! Having said that I think this has great potential post-jam, it scratches that kind of Sludge Life itch so I'll be keeping an eye out!