Halo 2600 (Atari 2600) not completable

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What steps will reproduce the problem?
1. Start up the homebrew game Halo 2600 in Atari2600Hawk. Note the strange 
extra lines between the A and L and the 6 and first 0 on the title screen.
2. Play the game up until the fifth purple room (the one with three shooting 
enemies).
3. Try to exit the room. The Master Chief will suddenly face right and bounce 
against the left edge of the screen, unable to continue further.

What is the expected output? What do you see instead?
I expect a very fast room transition to occur and to be put into the next room. 
Instead, something prevents me from continuing on normally.

What version of the product are you using? On what operating system?
BizHawk 1.7.1. Windows 7 Pro 64-bit.

Please provide any additional information below.
This game plays perfectly on console 
(http://www.youtube.com/watch?v=w_p6Se4xYtU?t=1m2s) and I've heard it is 
completable on the emulator Stella as well, so I am quite certain this is a bug 
in A2600Hawk.

I have uploaded a video that shows how it looks to me, if it matters: 
http://www.youtube.com/watch?v=Aw_I9YwAO2g

Original issue reported on code.google.com by coolkirb...@gmail.com on 9 Jul 2014 at 3:29

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Original comment by Scepheo on 29 Aug 2014 at 9:15

• Added labels: Core-Atari2600Hawk

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Original comment by Scepheo on 29 Aug 2014 at 9:16

• Added labels: Type-Defect