Interesting gameplay loop. Having some tutorial would be helpful, it took me some time to realize that I needed to press a letter on the keyboard to absorb (?) a shape and take it to the pipe. Sometimes the letter showed up and sometimes it did not. For the music, I like how it was intensifying as the time bar of the engine started to decrease. Dimming the level also made it obvious that something bad was going to happen. Good job on this, I would love to see more levels!