This is not sponsored and I'm not the developer of the plugin. I found Fast Script Reload while I was randomly navigating "New Releases Discounts" in the AssetStore in December.

It was only $5 when it launched and I bought immediately. At first I thought it was bs.

It promises to Hot Reload script changes WHILE PLAY MODE IS ACTIVE, it means you can play and edit code on the go (a thing that Godot and UE does naturally, oh well...).

Anyway... I'm using it in the jam and it's really working out.

The bad part is that it still doesn't support adding new fields nor properties and no new public methods. But all the rest work (changing existing methods, changing values of fields and properties, adding local variables, etc)! It's crazy.