I like the mix of 2D and 3D the visuals are great. It's pretty solid but I think it could use the introduction of a new mechanic to add more interesting gameplay. Adding a sound effect to jumping might be good along with some more monster noises for the things that chase you. I found it sometimes hard tell if an object was in my path or not, something visual to help with the perception of depth would be good I think. Also for some reason on the snow level it felt like my camera was lagging behind my character making it harder to anticipate things coming toward me, but idk if that was intentional or not
For immersion I would suggest improving the audio and adding more lively characters/environment models in the background, like two people standing having a chat, a moving windmill, etc
Nice work