I've been doin some optimization work for Act 2, It performs better than Act 1, with a few downgrades:
1. Shadows have sharper edges, and may not be as life-like, But gave a Major performance boost.

2. Volumetric fog is no longer present in the game, Unless there's an Area that isn't as demanding, and it can handle the Volumetric fog without a Noticeable performance dip.

3. Motion blur has been removed (although i personally like Motion Blur, it is removed due to Performance) Although, I may add a Toggle in the future though!

With the different settings, Avg Utilization went from 58% At high settings, 58% Screen Resolution/TSR

To 38%! This is across all 3 Act 2 Maps, Employee Parking Lot, Atrium, Main Lobby.

Also, I've noticed some complaints about Act 1's File Size:

All the textures are 1080P, and under 5MB Each

All unused Textures, Characters, Mesh, Blueprints, SFX, and Maps were removed before release. All SFX (Music, Sounds) are even compressed up-to 80%

UE just has big file sizes in general, A Base, Near empty Project is up-to 300MB Packaged.
While i can agree with complaints about the file size, Since it's obviously bot ideal for something Like gamejolt, it's always something im working to improve, It's just not something easy to do.