Game scope is a micro-compositor, it’s how the Steamdeck handles games and probably steam. Basically the settings there, you can have the game in 1080p but upscaled by FSR/DLSS to 4k. The difference is that only the game is upscaled, not the whole system
Heroic is a launcher for Epic, Amazon, and GOG
Yes, it can be seen as an alternative to Bottles/Lutris but the stores and libraries are baked in