Update: both boku ga koroshita kimi and Destiny of vampire are among the posted, and I think that's the only songs on their second demotape.
Theyre all 128kbps MP3 files with no ID3 tags.
It also includes two songs called Despair and Silent. Not sure if they were released on tape or not.
If you snoop around on the Misery website you can also find Misery - SISiDE ~taijin kyoufushou... as practice or live version (Think that is the name, on the site it is labeled as: 「悪夢ノ傷跡」)
And since it was posted by Misery, I'm pretty sure they dont mind you downloading those.
The only problem I have with anything that isn't on "思考障害ノ僕…×××？" is that the files I have are corrupted so it skips a lot : / . From what I've heard they sound good, but I just listen to that release the most because there's no 3 second gaps missing and no popping noises. Are the ones you posted...clean, I guess?
It's not hard to get their songs, as alot of them were posted after the bands breakup, or before.
As for similar bands- Their early stuff, before half the band quit, I would probably say Earl Grey, just no synths. After half the band quit and new members joined, they were far more upbeat in my opinion. I think they're worth checking out.