Is there a straight list of all major glitches in the game? There's an invincibility glitch I found, but I am not sure, if it's new, or someone found it. At least I saw no info besides mine anywhere.

There isn't a list of major glitches anywhere, although you can ask in the discord if you have a specific question about a glitch. You're a lot more likely to get an answer there than here.

As for your question, multiple ways of getting invincibility with dream gate are known at the moment, so while it's possible that you've discovered something new, it's likely already known about. Regardless you're welcome to post a video or just a description of what you want to know about in #glitched-discussion if you're still curious.