Wow you managed to put together an amazing game.
First of all good job saving the game data even when I close the game, I don't even know how you did that but good job.
Also, the mechanic of keeping the upgrades even after you die is a great way to connect the platforming to the jam theme, and makes it original.
Even though you didn't create all the assets or the music, everything feels very cohesive and the background music feels great with the game theme.
I couldn't finish the game because I didn't want to make all those jumps again before the dash part, so a checkpoint there would have been nice, also missed some sound effects on the jump and dash, but overall the game is amazing, every upgrade added a layer of complexity and the level design was really good.