Absolutely blown away by how high quality this is. The art is without a doubt its best strength.
As Sirhe mentioned, I think having a more forgiving telekinesis/magnet/whatever it is, would be great as you'd have to slowly drag the crystals or else they'd fall. I think another addition that might be great is having multiple mouths, or just getting rid of the crystals being eaten one by one.
Overall, congrats on the amazing game! Looking forward to seeing where you'll go with it.