Very enjoyable game, congratulations on this amazing submission!
Even if the art looks simple, I like how you managed to leave the drillers traces on the screen, it looks awesome and the explosion effects are very cool too. Some extra polishing on the background art and it will be outstanding for sure.
I really liked the audio, the main sound loop is funny, fits well in the game and I love how you manipulate it when grabbing the power up, extremely cool detail that adds to the overall experience.
Congratulations again, hope you keep up the good work :)