I am thrilled that you are trying to encourage Valve to make a Portal 3 by making your own whole new indy re-build of the original, but with new concepts added. That is awsome, and although I don't think Valve is going to be swayed as easily as this (lets face it, they don't care about their users' happiness and haven't for a long time), I share your wish that Portal 3 would be made a real thing. Buuuut if this is going to have a shot, it needs to get ironed out. I got to the "new thing in 3 2 1" room, a...

You have to grab the box and jump on it. Very difficult, not portal related. Terrible level by a troll developer. You have been warned players, this is not what you signed up for. I think other levels require bugs too? Not sure though. There are definitely some very good puzzles though, level 9 looks great....

Only way I've seen it been done is to shoot a portal while inside a portal.

It's common to not get a time portal at all, or for the upper button to make the 2nd time portal on the lower level. Also I can't figure out level 7.

Here is a full walkthrough video for the entire game. It shows the intended solutions for each level, but other variations may exist. Obviously some very heavy spoilers ahead. https://youtu.be/ER-Ec33x3uk Enjoy!