well, 3 seconds were no joke. but i'm still going to play one of your newer chambers, let's see if you have learned some things ;)

you might try a few of my chambers as well, e.g. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=75876155

@EC__, Hey! This is one of my first chambers, of course it is nothing to be proud of. -.-

deep linear 3 seconds chamber

as you said easy, but good.
could have been longer, with more elements.
good for beginers or a load like this, if you want to play portal, but are already tied,stressed or been drinking.
looks like you spent a lot of time, on the structure. but a lot less time on the challenges.
I was guilty of this on my first map. my second, I thought it out more.
1st map: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=77671664
hint: don't let door close to soon.use as cover.
2nd map: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=80012838