Hey, level designer here! Thank you for your comment!
Actually all rooms were designed in a way that you can go through with any power! Some of the aren't as obvious, but you can do it. Every ability got an platforming aspect, so the gameplay keeps changing. Of course, as a dev I'm way more used to them, so its easier for me (as it is to any dev, playing his own game).
We are making a longer game for the post jam, so it has more time for you to get used to the weapons. So you wont be getting the hardest weapon (magnet) in the hardest rooms (spiked ones) lol! Hope it didnt ruin the experience for you, my job here was really rushed.
Also, if you like one weapon more than others, you can skip the other power ups, and finish the game with one weapon (any of them)! That way the weapon change mechanic wont bother you. We also thought it would be easier if the game paused when you get hit, so you can plan your next moves with the next weapon. Just an ideia. :)
Thank you for your in depht comment, it will surely help us to make a better full release!