couple of very minimal changes. runners are now lockstep instead of each having its own bpm (sorry polyrhythms but i ended up not liking that code) and i can erase all runners without having to restart the whole program.
lots of UI to do, lots of things to add. but it's so fun
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mostly logic/behaviour changes that aren't really visible. new "directional" tile type allows for runners to warp back to their initial position
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finally added snare and bass, runners are sprites now, some other changes under the hood
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