Nice and weird. I like that the tower can appear in any existing campaign that might be happening. I like the animalistic powers the players can get, though I think its a slight missed opportunity to (somewhat horrifically) transmogrify the players as part of the process.
I like the twist of the wizard being dead, but it feels a little anti-climactic to reach the top and not have some kind of showdown happen. The escaped monstrosity would be a natural choice.
I do wish there was a bit more going on on each of the levels rather than a single encounter, but its understandable given the jam's space limitations. I think expanding out the dungeon after the jam would greatly improve it.