Out of the box, standard resolution scaling is manual. If you build your game for 1920x1080, it may look tiny on a 4K monitor. While you can code dynamic scaling, it requires more events than some engines.
The engine was built for this. The "Platform Movement" object handles slopes, one-way platforms, and variable jumps with zero coding. Games like The Escapists (Team17) and Freedom Planet used Fusion to create butter-smooth controls. clickteam fusion 2.5 standard
Honesty is important. Clickteam Fusion 2.5 Standard has limitations: Out of the box, standard resolution scaling is manual