Thanks for the feedback!
Portals are always a good idea but even wthout them, we ran a little bit out of time and couldnt polish all like we planned.
Maybe too much level design or too much ideas xD
Yes, the batteries are collectibles and when you find all, there is another ending for the game.
I think for our second(my first) game jam, we did a good job and learned many new things.
P.S.: WOW you weren't supposed to see that.