Managed to run the game on Linux using
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after some shenanigans.
You can unpack contents of *.halva2 archives in "GamePackages" (those are: AssetsPackage.halva2, AudioPackage.halva2, DatabasePackage.halva2, EnginePackage.halva2) using python script provided above into folder named "www". It must have following folders/files in it: audio, data, fonts, icon, img, js, movies, index.html, package.json, supertoolsengine.html.
Replace another RPGMakerMV game's "www" folder with you folder (Dunno if this step is needed). After that install rpgmakerlinux-cicpoffs tool. And use "RPG Maker MV/MZ Options" to launch it (right click *.exe in your distro's file manager) with nwjs version set to v0.48.4 (otherwise it breaks and crashes after prologue video).
Game seems to be using "RPG Maker Cook Tool Deluxe" by AceOfAces that supposed to protect game assets and source code. It clearly didn't do either of those, unless they didn't want to use those encryptions in the first place. but in that case 10$ were still wasted there...
