Just to add more context, the issue only occurs on Linux when using Proton, it does not occur on Windows.
Related Steam discussion here
The leak happens on the 10.0-2 beta, Experimental and Hotfix, though I've had it happen after varying amounts of time (from ~15 minutes to ~2.5h). Other Proton versions won't run the game at all.
My ProtonDB report contains my system info
@Skytis Just so you know, you can press Alt+F4 at any time as the game is seeded. If for example you have a cerise jackpot in round two at the third draw and lose the progression of this round, you will get the same round again when you restore your run
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
Symptoms
Memory leaks very rapidely, in about 15 minutes of gameplay the game reaches about 60% of system memory available (about 25GB of memory used), rapidely increasing.
Leads to OOM unless restarting the game.
Reproduction
It seems to happen in later parts of the game (with lots of combos), but can be easily reproduced (nothing special to do, just play).