The developers often host public demo builds on itch.io to test new features.
Gunner, HEAT, PC! (GHPC) is not a free-to-play game; it is currently available for purchase in on Steam for $29.99 . While you cannot download the full version for free, there are legitimate ways to play for free or support the project through various builds. 🕹️ How to Play for Free Gunner, HEAT, PC! Free Download
A free playable demo is available on the Gunner, HEAT, PC! Steam page , typically featuring a selection of instant action missions and vehicles. The developers often host public demo builds on itch