Hey, just tried your game! It seems like a lot of fun! The biggest thing I'd suggest adding before the jam ends would be explanations to the various potions, levels, etc. Because, personally, I couldn't tell what any potion did, especially since they all went out at once. Another feature that may be smart would be to add separate cooldowns for each potion, as it'd make this even more of a bullet hell
What I'd personally use for the explanations would be a void OnMouseHover(), then add some text boxes that contain text about what these buttons do :)