Hi Gypopothomas, I had managed to complete the game, despite dying numerous times within the mansion. Also, upon further inspection, the down + jump mechanic only works if you press and hold down Jump (throughout the action), and then press Down D:
Hey. When I said I fixed it, I had fixed it... I just forgot to upload it. Haha! The new update was up a few days ago. I'm 99.999999999% sure the drop down controls are fixed now. Fingers crossed!