Huge issue of inconsistent sprite rendering across different Mac / Win PCs (same build) - help?

Hi Everyone,

I'm currently developing a 2d game, targeting PCs at the moment (both Windows & Mac OS)

It's all well and good, Unity is fun to work with etc etc. However, I just came across a really annoying issue - basically the looks of the game (using sprites only of course) is very inconsistent on different PCs, to a point it's a dealbreaker to me if not solved.

Initially, on certain computers the game looked very "blurry and milky" - after browsing through some answers here, I've disabled mipmaps and changed bilinear filtering to point (no filter). Applied to all sprites of course.

There's still a problem though, and a big one I'd say. Please take a look at the side-by-side comparison below. Each screen was taken on a different Mac Mini, but plugged to the same display - the very same build of the game was launched each time (no settings were tweaked etc):

The "Correct" version is the way the game looks when launched in the Unity Editor - and it's the way I expect it to look (and it does on certain computers).

The "Wrong" version is what happens on certain PCs / Laptops. The sprites are noticeably more "pixelish" - but that would be acceptable I suppose. The main thing is the terrible miscolouring, and apparent issue with sprite alpha - and the overall "too blue, too bright, too milky" look of the game

So, after having done a number of tests with the same game build launched as is - on some windows machines the game looks the correct way, on some others it looks the wrong way. Similarly, on some Mac Os machines the game looks the correct way, while it's wrong on some others

Can anyone help please?

Thanks,

Luke