I love your graphical style. The soft shading and palette choice, and laser beam vfx and boxy aesthetic, they all come together just right. You're a pro in this department.
I think your tutorial / the player's first 60 seconds is the weakest element here. I tried to read your tutorial a couple times but I have to admit my eyes kinda glazed over. Miles better would be a short, structured scene that introduces players to each core element of the game one by one before turfing them to the main scene. I would also start the player with the double jump or like, a little hover backpack for this guy would be cute, right? It would make the platforming way more forgiving and encourage freer exploration.
All in all, very well done! A fantastic entry and big undertaking for 1 man in ten days and certainly one of the most impressive projects I've seen in the jam so far. 👏