Great idea with great execution!
This game is very well made! I love that the game teaches you how to play it. Each level asks the player to learn one thing at a time and solve a complex problem sightly more tricky than the last. The one mechanic that the game revolves around is simple, unique, and interesting. The music and art are good, but those aesthetics could match up with the mechanics a bit more. I like that the music is catchy, but never tries to actively grab the listener's attention, letting them focus on the puzzle.
My complaints are about one small glitch (probably not common) and an issue with the main mechanic. Getting the technical stuff out of the way, I managed to set the teleporting goo as I was falling across a corner, and the game placed the teleporter inside the wall. This allowed me to drop inside the wall and... interesting things happened from that point on. I really can't explain it any better than that, sorry.
As for the problem with the mechanic, there were some later levels whose solutions were not aesthetically pleasing. When I found the solutions, they LOOKED wrong. With goo hanging off the corner of walls, and goo piles sometimes overlapping, my solutions appeared to be wrong but ended up solving the puzzle. This created an inner conflict in the back of my mind, where my solution was not fully satisfying. My suggestion would be to make a clearer difference in the motion of the color pick-ups. If there is a GREATER difference between a green goo launcher and a red goo launcher, this would allow for different paths to stand out.
Still, this is a fantastic game! Keep up the great work!