I've run out of likes to give today, uh oh. π
I'd like to say a huge thank you to the overwhelming response thus far!! I hope you are all enjoying the WAD! If you do find bugs etc, please report them so that we can fix them for RC2. :)
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You're able to use either, though I've observed notably higher frame rates when running with OpenGL, so would recommend that personally. :)
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This is interesting - what compatability options are you playing with? If playing in GZDoom, I think you'll need to play with "default" in the compatability mode. As described in Tristan's above post, it seems GZDoom's MBF21 compat ignores new flags such as "Block Player" and "Block Land Monster". π