Glad you liked it! Falling through the floor was a bug which happened because the spawn point was a little below the ground.I hope It's fixed now :)
There are a couple somewhat tough to spot oddities/anomalies - not very subtle but difficult to notice I'd say. While fixing the bug with the floor/wall, I also changed it so that oddities only stop appearing if you actually spot them - so give it a try again if you want to search the ones you missed on the first go .
It was a little too ambitious for 3 hours I guess - so many things went wrong - flickering textures, images, lights. Bugs. Pfuu.