I had my first speedrun for a game I made sent to me today!
I had a go and managed to beat the game in 29 seconds, but that's just ridiculous is currently the record holder at 27 seconds.
A few optimisations you can try; make sure your mouse is close to the left arrow when the game starts and when you're inputting codes into the tumblers, input the highest number last - you can spam clicks and as soon as the code is correct it will auto-open. No need to worry about overshooting :)
I have a channel on my Discord for Silent Bill here: https://discord.gg/Kqm9pUt