Thank you very much for the review and I'm glad you enjoyed it!
The spotting through the wall was done on purpose, since level 1 doesn't really have a lot of challenges (but I also wanted it to be easier)
Level 2 and 3 is when the puzzle component really kicks in, so you need a couple of playthroughs to figure out the puzzle,
The jumping but has been in the game for a long time. I've fixed 90% of the problematic areas, I'm sad to hear it's still there. Usually it helps to walk on a different platform then returning.
Definitely good point for all levels to be unlocked for a game jam!
Thanks again :)