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My approach is sacfricial attacks to seize the initiatiave then for for the king. Should I have won this one? Why didn't I? All thoughts welcome.
[Event "Play against an engine"] [Site "Lucas Chess R 2.16a"] [Date "2024.12.23"] [White "Marcus"] [Black "Cinnamon 1.2c"] [Result "1/2-1/2"] [ECO "B23"] [TimeStart "2024.12.23 15:32:27"] [Opening "Sicilian Defence: Closed"] [Termination "Draw by threefold repetition"] [TimeEnd "2024.12.23 16:11:36"] [TimeControl "600+5"] [PlyCount "80"] 1.e4 {[%emt 00:00:3.73]}{[%clk 00:10:1.27]} c5 {[%clk 00:10:5.00]} 2.Nc3 {[%emt 00:00:2.77]}{[%clk 00:10:3.50]} e6 {[%emt 00:00:19.66]}{[%clk 00:09:50.34]} 3.f4 {[%emt 00:00:23.86]}{[%clk 00:09:44.64]} Be7 {[%emt 00:00:19.30]}{[%clk 00:09:36.04]} 4.Nf3 {[%emt 00:00:51.48]}{[%clk 00:08:58.16]} Nf6 {[%emt 00:00:18.95]}{[%clk 00:09:22.08]} 5.d3 {[%emt 00:00:14.64]}{[%clk 00:08:48.52]} d5 {[%emt 00:00:18.59]}{[%clk 00:09:8.49]} 6.e5 {[%emt 00:00:37.31]}{[%clk 00:08:16.21]} Nfd7 {[%emt 00:00:18.25]}{[%clk 00:08:55.24]} 7.d4 {[%emt 00:01:6.84]}{[%clk 00:07:14.37]} Qa5 {[%emt 00:00:17.92]}{[%clk 00:08:42.32]} 8.Bd3 {[%emt 00:00:37.98]}{[%clk 00:06:41.38]} c4 {[%emt 00:00:17.59]}{[%clk 00:08:29.73]} 9.Be2 {[%emt 00:00:23.92]}{[%clk 00:06:22.46]} b5 {[%emt 00:00:17.33]}{[%clk 00:08:17.40]} 10.Bd2 {[%emt 00:00:53.58]}{[%clk 00:05:33.89]} b4 {[%emt 00:00:16.97]}{[%clk 00:08:5.43]} 11.Nb1 {[%emt 00:00:39.83]}{[%clk 00:04:59.05]} Nc6 {[%emt 00:00:16.67]}{[%clk 00:07:53.76]} 12.a3 {[%emt 00:00:35.86]}{[%clk 00:04:28.19]} Ba6 {[%emt 00:00:16.41]}{[%clk 00:07:42.35]} 13.c3 {[%emt 00:00:28.73]}{[%clk 00:04:4.46]} b3 {[%emt 00:00:16.15]}{[%clk 00:07:31.21]} 14.O-O {[%emt 00:00:17.30]}{[%clk 00:03:52.16]} Qa4 {[%emt 00:00:15.83]}{[%clk 00:07:20.38]} 15.Qe1 {[%emt 00:00:36.77]}{[%clk 00:03:20.39]} g6 {[%emt 00:00:15.56]}{[%clk 00:07:9.82]} 16.g4 {[%emt 00:00:54.12]}{[%clk 00:02:31.27]} Bb5 {[%emt 00:00:15.30]}{[%clk 00:06:59.52]} 17.f5 {[%emt 00:00:32.87]}{[%clk 00:02:3.40]} gxf5 {[%emt 00:00:15.04]}{[%clk 00:06:49.48]} 18.gxf5 {[%emt 00:00:15.95]}{[%clk 00:01:52.45]} exf5 {[%emt 00:00:14.80]}{[%clk 00:06:39.68]} 19.Ng5 {[%emt 00:01:46.70]}{[%clk 00:00:10.76]} f4 {[%emt 00:00:14.53]}{[%clk 00:06:30.15]} 20.e6 {[%emt 00:00:59.64]}{[%clk 00:04:19.47]} Bxg5 {[%emt 00:00:14.29]}{[%clk 00:06:20.86]} 21.exd7+ {[%emt 00:00:5.22]}{[%clk 00:04:19.25]} Kxd7 {[%emt 00:00:14.07]}{[%clk 00:06:11.79]} 22.Bg4+ {[%emt 00:00:7.77]}{[%clk 00:04:16.49]} Kc7 {[%emt 00:00:13.84]}{[%clk 00:06:2.94]} 23.Bxf4+ {[%emt 00:00:5.66]}{[%clk 00:04:15.83]} Bxf4 {[%emt 00:00:13.63]}{[%clk 00:05:54.31]} 24.Rxf4 {[%emt 00:00:8.89]}{[%clk 00:04:11.94]} Rag8 {[%emt 00:00:13.41]}{[%clk 00:05:45.90]} 25.Rxf7+ {[%emt 00:00:15.79]}{[%clk 00:04:1.15]} Kb6 {[%emt 00:00:13.21]}{[%clk 00:05:37.70]} 26.Qg3 {[%emt 00:00:39.23]}{[%clk 00:03:26.92]} Ka6 {[%emt 00:00:13.00]}{[%clk 00:05:29.70]} 27.h3 {[%emt 00:05:3.29]}{[%clk 00:03:31.79]} h5 {[%emt 00:00:12.80]}{[%clk 00:05:21.90]} 28.Qc7 {[%emt 00:00:11.33]}{[%clk 00:03:25.47]} Rg5 {[%emt 00:00:12.59]}{[%clk 00:05:14.31]} 29.Qb7+ {[%emt 00:01:49.83]}{[%clk 00:01:40.63]} Ka5 {[%emt 00:00:12.41]}{[%clk 00:05:6.89]} 30.Rf5 {[%emt 00:02:22.65]}{[%clk 00:04:27.37]} Rgg8 {[%emt 00:00:12.22]}{[%clk 00:04:59.68]} 31.Nd2 {[%emt 00:01:47.14]}{[%clk 00:02:45.23]} hxg4 {[%emt 00:00:12.05]}{[%clk 00:04:52.63]} 32.Rxd5 {[%emt 00:01:30.88]}{[%clk 00:01:19.35]} gxh3+ {[%emt 00:00:11.87]}{[%clk 00:04:45.75]} 33.Kh2 {[%emt 00:00:23.58]}{[%clk 00:01:0.77]} Rg2+ {[%emt 00:00:11.70]}{[%clk 00:04:39.05]} 34.Kh1 {[%emt 00:00:18.20]}{[%clk 00:00:47.57]} Rxd2 {[%emt 00:00:11.52]}{[%clk 00:04:32.53]} 35.Qc7+ {[%emt 00:00:3.09]}{[%clk 00:00:49.48]} Ka6 {[%emt 00:00:11.37]}{[%clk 00:04:26.16]} 36.Rd7 {[%emt 00:01:20.45]}{[%clk 00:04:38.74]} Rh5 {[%emt 00:00:6.80]}{[%clk 00:04:24.37]} 37.Qb7+ {[%emt 00:00:39.95]}{[%clk 00:04:3.79]} Ka5 {[%emt 00:00:11.14]}{[%clk 00:04:18.23]} 38.Qc7+ {[%emt 00:00:17.89]}{[%clk 00:03:50.90]} Ka6 {[%emt 00:00:11.01]}{[%clk 00:04:12.21]} 39.Qb7+ {[%emt 00:00:2.92]}{[%clk 00:03:52.98]} Ka5 {[%emt 00:00:10.84]}{[%clk 00:04:6.38]} 40.Qc7+ {[%emt 00:00:3.25]}{[%clk 00:03:54.74]} Ka6 {[%emt 00:00:10.71]}{[%clk 00:04:0.66]}

Am still not entirely sure how the computer is selecting its moves.

In these games, are you setting the computer to play to a certain level? (You mentioned a rating of 1935 in a previous post.)