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The Doppler readme links to a nice introduction to Verilog video which has a simple example of creating a counter and using the high bits to blink a LED a couple Hz.

Here is the Verilog:
https://opentechlab.org.uk/videos:013:notes#example_1blinking_leds

module top(input clk_100mhz, output [3:1] led);

reg [25:0] counter = 0;
assign led = counter[25:23];
always @(posedge clk_100mhz) counter <= counter + 1;

endmodule

I think it would be nice to have such an example for the Doppler. The LED matrix is awesome but it might make it easier for a Verilog beginner to understand how to blink a single LED.