I enjoyed this. The graphics are pretty, the menu and death screens are just awesome, and the music does a great job adding to the quirky, adorable nature of the game. This is definitely one of the more unique and eye-catching titles.
For critiques: it does feel like you get caught by the crystal bugs reeeaally suddenly. Maybe an exclamation mark and a second of delay to give you a chance to drill to safety would help? Stealth games often have quite a bit of wiggle room. I also think the camera shouldn't be moving like that when I press left or right. It's a bit disorienting.