I was playing and suddenly the screen became all black 

here's what I found in the console

 Encountered an error in command `<bevy_ecs::system::commands::entity_command::despawn::{{closure}} as bevy_ecs::error::command_handling::CommandWithEntity<core::result::Result<(), bevy_ecs::world::error::EntityMutableFetchError>>>::with_entity::{{closure}}`: The entity with ID 699v6 does not exist (enable `track_location` feature for more details) log.target = "bevy_ecs::error::handler";log.module_path = "bevy_ecs::error::handler";log.file = "/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/bevy_ecs-0.16.0/src/error/handler.rs";log.line = 155

it seems to hit some form of error every 3rd playthrough in which it doesn't tell you what caused your end - boom or low quota. Neat but needs that bug fixed :P
It also seems impossible to go over about 2-3k generation (with the town wanting about 5k)