Ah, and as an end note: perhaps, adding basic symbols as well as colour would be useful. Recall Mark Brown's video on accessibility - and beyond just the colourblind, such a change would also be helpful to those who easily forget what block they need to push.
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Thanks for the very comprehensive and detailed feedback, it's very valuable to me. I think you're right about a lot of points. Whether you could tell or not, I tried in many ways to prevent soft locking in my design, but it was hard with how the game inherently works, and the little time I had to do it in. I certainly agree with adding symbols for accessibility. Thanks for playing!