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QU4D v2

The first cube is destroyed every time you push the button to let it out of the excursion funnel. Also, this part of the test is skippable by using portals to fling up to the push button.

Agree with nicklonium, that button needs an antline or signage. The timer is so short, that the player has to press the button severall times tjust to finf out what it triggers. ot only you should place a visible connection, you should add more seconds to the timer. What's the purpose of making the player rushing to place that portal? It's not much of puzzle. But other than that I enjoyed the chamber,

Feel free to test my map Se7en Sins and give me your feedback afterwards, I'll appreciate it []

Not bad, I can at least see what the player is supposed to do but there's too many exploits (as noted previously) which make most of the chamber skippable. You might want to redesign the chamber slightly to make sure your intended solution is the only solution. Also, it's a bit of a pet peeve of mine when designers leave critical items unlabelled, especially when the function is timed, so I'd also suggest adding an antline or a symbol to the button in the last room.

I've got a little collection of chambers going and I'm always interested in feedback on each chamber or the collection as a whole. I'd be grateful if you'd have a look:
Elementary

Someone here must love the fencing ;)

this is a short yet cool level. It's not quite my difficulty level, i'd like it a little harder, but it's still a good level :)