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Never have I ever played a game so frustrating and satisfying at the same time

This is both relaxing and engaging. I could probably just chill and play hard mode casual on this for hours, untangling all the little constellations.
I really appreciate a puzzle game that is designed well enough it doesn't require any instructions to get into.

Cool, but without a leaderboard, or mechanism keeping track of my best time, medals for succeding in a given difficulty in a given time, something, it feels a bit pointless. I tried a medium run, did it in 3, a hard in 5, then 10, which shocked me a bit- the difficulty wasn't that stable- then did two custom rules runs and found the options there lacking- I even had to re-set the settings once I used them. Played a bit more: a run in medium casual mode where I didn't even notice what changed, then a casual easy run I finished with ridiculous ease, went to check my time, and realized what casual mode was.

It's a good game, all it needs is polish. A leaderboard, music, something. As is it's too empty- I didn't even realise what 'casual mode' was at first, it just isn't explained!

Once you get the hang of it, it's very simple, yet can still be a bit complex.
A very fun brain tool. Nice job!