Fantastic game. Really great. I loved it (I'm a puzzle game fan, so it scratched all my itches).
I found the puzzles the perfect amount of challenging, which means they might be a touch too hard for some folks, but I loved it.
As far as criticism, if you want some, the only puzzle I felt was a little frustrating was the laser race. It felt more like a trial and error run than a puzzle. I didn't get to use my learned skills as much as I just had to do a couple runs to figure out where everything was. Does that make sense? I couldn't use my awesome puzzle skills and figure out the solution on the first try. And I thought the number "doors/blocks/locks" could've have been clearer if they were up or down. Without another one to compare it too, I wouldn't be able to tell at a glance.
Other than that. It's a perfect little game. I would go as far to say this is my favourite game of the jam so far. Great game. Great polish. But I am biased... I love puzzle games.