Nice game concept with nice 3d models.
I thought it was a neat idea to have the 3 animal skills. The user interface could be more clear about which skill is currently active. The mole dropping the character into the ground was obvious, but grasshopper and snail I saw the yellow poof but wasn't sure what happened. Only after a bit, I noticed my jump was really high because grasshopper must have been set. I think this could be improved by changing the color of the active skill tile or outline the tile for the active skill.
Movement was a bit rough and walking through doors was not very smooth as the colliders on the player or door made it a tight fit.
For level 1, I didn't get the cubes to stack (maybe snail could have done this somehow). But I made the large jump up just by spamming jump and eventually I got up there. I could not determine how snail worked. And I didn't need the mole skill (but I did think it was funny how the legs and body dangled under the bridge, since the location of the model was just lowered).
In level 2, I didn't really see how the skills helped much. maybe you needed to be small to go down the final tunnel...or the bat to get jebaited? Not sure what the bear (being big) did. Did fall through the world once, but it looks like you had logic to reset the level.
level 3, in the maze there was a invisible ceiling which makes sense to prevent skipping ahead with grasshopper, but for level design, it might be better to not have grasshopper jump as an option. I guess getting hit by the spike traps took one of my 'two lives', I saw blood, but not sure the lives were tracked on the UI.
While I like the concept of the changing skills, it would be nice to see these have more impact in the gameplay and some indication which skill is being used. Ideas: Grasshopper - glow around your legs, Snail - slime trail, Bat - screen color tinted with another color to indicate using 'vision' skill.
The music and settings were nice and tranquil. A lot of time building your levels with all the models, good job putting the levels together.