Hello Raiu,
Thank you for your feedback.
1) The wall bug has been fixed for Release Candidate 2 (RC2). I'm glad you found it because I could not replicate it on my keyboard, and I would not have known otherwise.
2) Yeah, I took a deviation with bonus points adding up instead of multiplying. I was worried about people wrapping the score too easily. However, seeing that the overall scores have been pretty low I have since changed it for RC2 to be a true multiplier. Points might not exactly match the arcade version, but it will be more rewarding and increase the score overall.
3) The original Atari version didn't allow points for killing monsters until the treasure was collected. This prevents cherry picking to get a high score by continually entering/exiting the room to kill a close monster without getting hit. To get more points you have to dodge the monsters and get to the treasure first. However, when I saw videos of people playing the game it showed me that most people found it fun to blast away. They also might have been upset about the lack of points except I don't think they noticed because of the rotation of texts at the top of the screen.
With that in mind I believe I figured out a way to get the best of both worlds. Simply put you will get points for killing monsters right away. However, if you exit the room without the treasure you will no longer get points for more monster kills in that room until after you pick the treasure up. This seems fair. Also, if you die before getting the treasure everything resets, so you will be allowed points for monsters kills again. This is already in place for RC2.
4) Yes, the big room music is not good. Iesposta also said noted it sounded off key, and I agree. I will work on it for RC2.
I hope to get RC2 done reasonably soon, within a couple of weeks. If anyone has more feedback please post.