I managed to get the last seal and be teleported to the center while still missing the super jump upgrade, which was kind of confusing until I saw the upgrade count on the map.
Yeah, a day or two before submission I realized that was going to be a problem. I noticed from watching some people test it out. Thats when I chose to add the upgrade count on the map. Honestly I should have provided a confirmation to go letting the player know that they havent collected all the power-up. I was just too tired at that point to make that change.
The fact it respawns you on the same room makes the loss of progress quite meaningless imo. I almost thought the boss fight would compensate on that, until I realized the boss's health doesn't reset at all when you die.
Unfortunately those design decisions were made to compensate for jams and participants experience with metroidvania's. I think next time, I'll just throw out consideration of experience and assume participants are huge metroidvania fans and know what to expect when they load the game up.
I'm glad you enjoyed the game overall and thanks for playing!