Yeah, there is something in Game Maker: Studio games that can make Windows find them suspicious and I have no idea what...Even I've got warnings of my own games after building them which is ridiculous.
You can add it to exclusions in Windows Security though, it has worked for me so it should work for you too. If you can't even download it, you should use a different browser, it shouldn't be up to windows if it's suspicious until its on your PC.
I was able to get it working and had a really great time! I loved the art and music and the variety of enemies and behaviors. My favorite might be the pink blobby guy? I don't know, that green tongue guy was pretty wacky. Great variety of ability upgrades too! My brain got a little tired trying to remember all the paths I still had to circle back to, so I got lost a lot, but getting through each room was straightforward so it really wasn't too much of a setback getting around. Great job!
