The game loop, so far, is about backtracking: Press a button, which closes the door behind you and allows you to go forward. Go forward, grab something, bring it back, press the same button, drag the carried thing through the first door. Do this three times and you finish a 'room' and can go even further back, but now the portal to that room serves as a power source.

Over and over and over.

With a slow moving character and very narrow doorways.

So far it's missing any 'wow' effect. Remember when we flung ourselves at high speed in Portal?

Nothing like that here. Even moving platforms are moving really slowly.

The game loop, so far, is about backtracking: Press a button, which closes the door behind you and allows you to go forward. Go forward, grab something, bring it back, press the same button, drag the carried thing through the first door. Do this three times and you finish a 'room' and can go even further back, but now the portal to that room serves as a power source. Over and over and over. With a slow moving character and very narrow doorways. So far it's missing any 'wow' effect. Remember when we flung ourselves at high speed in Portal? Nothing like that here. Even moving platforms are moving really slowly.