Some of the graffiti was extremely hard and I never knew if I was actually making any progress on each individual piece. It also gave little incentive to rush. I'd recommend making a version where you have 30 seconds and gain time by damaging graffiti to encourage players rushing through the way you intend. Also the backing music choice was interesting

EDIT: to clarify I love the sound design, animation, and graphics, so you did a lot right, it's just easier to comment on negatives of course.

Really nice bubbles and the timing on this is so close! I lost by 1 piece of graffiti so many times (it was mainly that piece on the biggest building)

Really enjoyed the game! I kept playing until I completed it. I would jut add an indicator when the bubbles hit the graffiti. I was confused in the beginning whether it was me being close or the actual bubbles that removed the images. But overall, great game!