I wish there was a steam tag people used but I think it's too niche lol.

Here's the ones I've found on steam - Nova Drift - SNKRX - BYTEPATH

Back in the day I played so many flash games like this, but unfortunately it didn't seem to spawn as much of a genre lol.

I don't think there's any central place or tag that captures this idea properly. Generally games like this tend to happen a lot in roguelike/roguelite tags (https://store.steampowered.com/tags/en/Roguelite/), but they can be anywhere really since theorycrafting/build-making is a very common theme in games.