Well.. I don't really think it's heat-related, but if you wanna check your temperatures you can download HWinfo ( https://www.hwinfo.com/ ) and check what max temperatures you have after the game freezes.
Make sure you have the right prerequisites. The proprietary driver is kinda behind the curve. People only use it for stability purposes, not performance. Ubuntu 18.04 isn't running the latest mesa stock, so follow those instructions.
You also have to take into account that this is still an alpha. Performance is gonna be bad for a while, and that's even before you throw things like WINE/proton in the mix.
The other thing is to dig around in the game files for a graphics config file and play around with that to tweak as much as possible. Your ram is shared between cpu and gpu so make sure browsers and stuff are closed. Consider even playing at 720p.
Your hardware isn't bad, but it's not something very fit for brand new games. You can trim the fat as much as possible, but it's not going to suddenly run at a smooth 60fps. I would aim for 30fps.
This game reminds me of Rise of Legends, 3 factions, Vinci, Alin, and that "protoss" like race.
The unfortunate thing is that the update server shut down and the only way to get Rise of Legends is through torrents now.
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Neverless I created an account just to comment because I am usually a lurker. I see alot of potential improvements to the game, but neverless I recommend the developers take their time and let this game mature like Starcraft 2, Age of Empire, and/or Company of Hero.
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More AI difficulties, AlphaIronHarvest sponsored by Google??
Mod support (I like to change supply/resource in Starcraft 2)
Cheat mode (Like cheat codes for PvE)
Offline/LAN play mode (Starcraft 2 even so is free2play seems to not remove that DRM.)
This game?? 0 A.D. (Open source cross platform free RTS, development is SLOW because its free.) https://play0ad.com/0-a-d-financial-report-april-2020/#more-4686
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Anyways I haven't played that game yet, but I brought the Deluxe edition to revive the RTS genre. I am willing to pay monthly fee for the games competitive scene because I don't want to see another Rise of Legends.
Those are daunting engineering work so I don't expect the developers to make those!!
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On an unrelated discussion, do you guys think EA Games has reformed C&C remastered and won't add microtransactions in the future??
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My take on microtransactions is that esports require like a constant money source and Blizzard did it with Warchest. Right now if I want to support Starcraft 2 tournaments I will have to subscribe to WardiTV.
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Aww whatever I am disorganized, but lets see if this game will mature into Company of Heros!!