The visuals are incredibly polished for this! The music is very nice and I like the idea of keeping enemies off the crystals as well as keeping them under control. I could only get the water splash to fire once and one of the flying enemies got trapped in the higher ground, letting them fire on one of the crystals while I couldn't hurt them.
The UI looks great, especially the mini map which is incredibly helpful. This is an impressive amount of work for 3 days, congrats to the team!