While I had a little trouble with knowing which places to go at first, I had a good time beating it. I think these are the endings in the game:
Endings 1-3: Fully human -> unaltered memory, no memory of stream, no memory of human
Endings 4-6: Anthro fox -> unaltered memory, no memory of stream, no memory of human
Endings 7-9: 100% fox -> unaltered memory, no memory of stream, no memory of human
Ending 10: Foxy human
Ending 11: Fox mannerisms
Ending 12: Run out of time
Ending 13: Lose all of your health
Ending 14: Reach the exit, but get sent back to the dungeon anyway
Secret ending: Go back to where you started after you collect all three keys. Move around the dungeon until you are nearly a fox. Then squeeze right under the gaps to reach the ending. It seems to be incomplete, however.