Super fascinating idea! Took a while to understand the controls, but once I did, I was on a roll (haha)
- I loved the the upgrades corresponded to the color of your lines, made them more satisfying.
- I was a big fan of the upgrades that made a visual change, such as extra line or extra speed. I think upgrades should have been a little more frequent.
- The art style works really well.
- I wish there was some more audio, even if it was a free music track you got from online.
- Some more game feel, such as particles when enemies die, would have gone a long way.
- Other then those nitpicks, this is a super excellent entry, you did something incredibly unique, I'm very impressed!
Great job!