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This issue is quite common on Remix OS for PC, especially when games are not fully compatible or when graphics acceleration isn’t working properly, which can cause apps to open and then close instantly. Updating GPU drivers, enabling virtualization in BIOS, or trying a different version/build of the OS can often help fix it.
On a similar note, when people just want to test gameplay or explore features before installing heavier setups, some also look at community versions like Null’s Brawl newest version, available at https://nullbrawls.org/, including iOS support, mainly for experimenting with gameplay experience. It’s always important to use stable and trusted sources depending on your system setup.
Graphics compatibility has always been one of the biggest challenges with Remix OS, especially for games that rely on newer rendering technologies. If you're interested in testing different game versions without heavy system requirements, NullsBrawlsAPKs, which is popular among players who want to explore custom Brawl Stars content and new features on Android devices.