The ability to speed up (as well as place colours without resetting) are already things we're looking into, just didn't really have time to implement them during the jam. In terms of difficulty, we settled for a puzzle at the end that utilised all of your available colours (even though you can do it in less if you're cheeky). I understand it's not the hardest thing in the world, but it shows off our concept well enough and was hard enough some people couldn't finish! We're planning on doing more with the project and I certainly have much more devilish puzzles in store. Thank you for playing!