I really liked exploring the mansion and the lock picking part!
At first I didn't understand how ghosts appeared, if it was something I've done or just after some time. Then I struggled a little to understand how to make them go away. It would have been nice to have places to hide or something to fight the ghost.
Overall, I did several games until I found all 3 items and I really enjoy playing Hoards of Horrors, congrats for your entry!
Edit : I forgot to mention about it, but be carefull with palette swap, it's technically more than 4 colours 👀
Edit 2 : My bad, see creators reply ^^