I’m very familiar with running out of time to execute your concept, don’t feel too bad, it happens! As a solo participant or a solo developer for most jams, I tend to try and go for very small scopes that I can hit quickly, and then work on improvements for the rest of the jam. I find this makes it more likely I can get something to submit, and usually I find this more motivating since I can play early and see it improve. I hope you keep working on this game if you like the idea, or gamedev in general!