Thanks!
I’ll add arrow keys and a visual cue for the bounds of the playing field.
Regarding how matches are cleared: I originally tried clearing whole blobs of one colour, but it felt too easy and not very strategic. Right now it clears lines of three or more - horizontal, vertical, or diagonal. Overlapping lines are allowed, but for example, two blocks sitting next to a three-block match won’t clear unless they’re also part of a line of three. I’ll think about how to make these rules clearer in-game so they’re easier to pick up.
So:
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→ clears completely
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→ only the three on the left clear
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→ the four on the left clear