If you clicked that "Ultrakill Download Google Drive" link and ran an executable:
New Blood Interactive allows you to download the directly from Steam. It includes the first two acts of the "Prelude" and the first boss. That is roughly 5 hours of content for a speedrunner. It is safe, legal, and updated. Ultrakill Download Google Drive
This feature would allow players to sync their progress and custom assets (like Cyber Grind patterns or custom music) across different machines using Google Drive. : If you clicked that "Ultrakill Download Google Drive"
If you have a friend who owns Ultrakill , they can enable Steam Family Sharing. You log into their account on your PC, download the game, then play it on your own account. It is 100% legal and free, though you cannot play simultaneously if they are playing any game in their library. It is safe, legal, and updated
Speedrunners and high-level players often need to play on specific patches of the game. A version hosted on Steam might automatically update to the latest patch, removing a glitch or mechanic a player wants to use. Searching for a Google Drive link often yields results for older, archived versions of the game that are no longer accessible through official launchers.