Cool entry, reminds me of 90's platformers. I like it. Could be a full game with enough work.
Pause menu does not seems to open in levels, only in main menu. So had to, turn off and on again :)
Got issues in level 4. Character fall through the floor. Got blocked on Level 5. as was not being able to jump back to the switch.
Generally for game jam I would prefer less levels, but with more polish to them.
keep it up. solid entry.