Love the artstyle. I spent way too long looking around the menus and admiring the art (especially how the icons zoom in, but the background also changes, and how the star fades out when you click the 'mute' star). Overall, the aesthetic was amazing.
Music and sounds were pretty good, suited the game quite well!
Gameplay-wise, I struggled with jumping a bit (momentum felt a bit wonky when jumping, like you lost most of your sidewards speed), but otherwise felt alright. Quite liked the gravity manipulation of the mage!
Game fits the theme really well, love the void coming in, the setting, and the gravity manipulation.
Otherwise really well done! I see this is your first GWJ entry, which makes it even more impressive :D Really well done, you should be proud of yourself!