I typed the entire post then had the thought...
If YOU want to keep at this, then I'll keep working too. These post don't look like much in the box, but when I preview them, they look huge.
Don't want to appear to be "pushing" you to work on something you are tired of working on. But happy to help, I have several games that didn't, and some that still are not working, and I try what solutions I can. So simply trying to assist in the same way.
So ideas and possible paths below...
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Did some digging on the heat issue, seems to be a common thing with Linux on laptops.
But, I ran across several ways to fix it.
Gives a few suggestions on the temp side of things:
https://itsfoss.com/reduce-overheating-laptops-linux/
Also read on a forum post somewhere, I closed the tab, as I type this I have 24 tabs open, 4 of which are google, 1 is subsim...
Someone with a HD 4530 installed the AMD drivers and it runs much cooler now.
As far as that and getting a bit more

out of your card...
Also dug up a bit more info on Mint 17.3 Rosa, it comes with, unless you updated it, the kernel and Xorg (the graphics/GUI server for linux) versions required to install the ATI drivers.
Mint is based on Ubuntu, so what works in one has the potential (but not always) to work for the other.
The latest driver doesn't support the older cards, but I'm checking the readme files with the previous drivers to see which is the newest to still support your card.
You can usually look in the update program to see what you have installed.
OR you can use the command line, I prefer the CL, but the graphical works to...
Can you tell me what versions of:
xorg-x11-server-Xorg
xorg-x11-server-common
that you have. (needs to be 1.17 or older, Mint Rosa ships 1.17.)
And also which kernel version, terminal command should be:
uname -r
'uname' and it should say 'Linux'
'uname -r' and it will tell you the kernel version.
This will let me nail down which driver will work for you IF you want to try the AMD driver.
I'm not saying that you will have to do all this, but Fedora 23 shipped 1.18, I had to downgrade to F22's Xorg 1.17, and then patch the driver install file for each kernel upgrade, then install.... it can be in depth, but that's mainly because linux is moving faster than AMD is.
Just a heads-up
Barracuda