Viability: The game is playable and I was able to reach the end! I did run into an error message while going through one of the shortcuts (I'm assuming that is the error you mentioned in the description!) and I included a screenshot in case that is helpful. For me the buttons on the death screen did not work, but all the other elements were fully functional. Something I noticed is that whenever you enter a room, you spawn at the same entrance regardless of where you came from, which can be confusing.
Presentation: The rules and goal are clear; move through the maze, avoid the bats, and look for the shortcuts. The movement is a bit floaty, slow, and awkward, though I feel that may be a quirk of Playground more than anything else. I would recommend tweaking the RigidBody and Move component settings to see if that makes movement less floaty (something I need to do for the game I'm working on too!) I also might see if the bats could be made to move a bit faster to make them more of a threat to the player.
Theme: You all nailed this! The pixel art is super cute, and the color palette fits the vibe of the game well. I like the design of the bats a lot, they clearly read as enemies to avoid. The game feels cozy and autumnal, I like the mood of it a lot.
Engagement: The only critique I have engagment-wise is that more responsive movement might make the game physically feel better to play. Looking for hidden paths in the corn is a really fun variation of a maze game, and I was engaged with that mechanic in particular. 