After changing to VSync, the game seems to be better, but everything runs slower and bullet collisions aren't accurate, is there a fix for that?
You definitely should fix the game to work with V-sync mode. Unlimited mode is only used for stress-testing and you can't release the game with Unlimited mode.
To improve bullet collision use stepping mode in bullet behavior. There is an official example for it in Construct.
Also you shouldn't use "Find path" for enemies on every tick, it's bad for performance.
Maybe it depends on the type of Graphikcard or memory if it doesn't appear on dops Computer.
I tested on a pretty old laptop with Intel HD video and 8GB RAM.