I'm glad you enjoyed it! I am always eager to make the start of a game very easy for me so others (who haven't already got 7 days' experience) can play it without issues - I might have gone a bit overzealous this time!
The red squares indicate that I haven't built all the tiles for the game. I didn't model any overhangs for this jam, which I imagine is where you saw the red squares. With more time I'd love to add more tiles, especially interesting ones for archways and vampire-magic-themed floating platforms.