well so uuh i fixed the faithplate removed the orphan cube fixed the fizzler (you have to fling the cube up) , removed the timer button and fixed the walls btw the teleporting to the exit was indeed intended. thanks for the feedback!

On top of the issues noted by Zeroman, there is also a misplaced white wall on the wrong side of the fizzler.
Alright, but let's follow this up with some actionable feedback:

1: Fix that white wall behind the fizzler.

2: Make the fizzler two blocks high and raise the gravity funnel by one block. Make the ceiling white with grating over it so the player can lift the reflector cube that way.

3: Remove the faith plate and ensure the ceiling by the exit door gravity funnel is white. The player must now use the reflector cube funnel to lift themself into the other funnel.

4: Remove the unnecessary dropper-less companion cube.

That should improve the chamber a good bit. There may be more ways to improve it but this is what I could come up with so far.
Also, as a general rule of thumb: Default to using white surfaces everywhere and only add black surfaces where they are needed instead of the other way around.

I'm gonna be honest with ya, from first look it looked like a excellent puzzle; Finally after looking around the recent page. However you can just cheat without even cheating at all.

What do you mean by that? well I will tell you now in STEP FORM!

Step 1: you can skip the cube button and portal over to the fizzlers up above.

Step 2: You don't need to use the tractor beam you can drag the cube over the fizzler and it will be fine.

Step 3: Use the reflector cube to activate the X laser relay and you can portal over to the door and EXIT.

4/10 I was really hoping for a good Chamber Puzzle FINALLY but nope just mistakes after mistakes. Sorry if this is your first chamber but by god; please PLAYTEST your maps properly.

if you hold a cube and look directly up, you can bring a cube above the 1 unit high fizzler and break the map