I gave this a higher gameplay rating because you're genuinely trying to explore a new game idea. 

This one falls into that funny territory where it mixes puzzle and action elements and ends up doing both half as well.

Each level did ask me to do something new. I enjoyed the thinking part of it, but I didn't really enjoy the action part of it as much. I would like to see the same challenges but untimed. 

I would say either focus on this being a great action game or a great puzzle game. Lean really hard into one specific genre and it will end up more focused and better overall.

This is great! This is such a good idea and even though the game is short you definitely explored this idea well. I'd love to see a full version of this, in general I love the idea of a defense-style game with portals. This game is  a very good mix of strategy and real-time action. Awesome work!

Cool puzzle game, would love to see more of it!

Also, I think there were some subpixel things going on when placing the portals, so I don't think it was true 64x64