I can't open the game on Android it just crashes after a couple seconds it's been like this since the 0.21.6a version
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Not sure why you got downvoted, it's a perfectly legitimate concern.
Nothing's changed in the SDK or fundemental code since 0.21.6a so if it's suddenly crashing for you then it's an issue with your device I'm afraid. Could be a lack of storage space, corrupted drivers, or an OS update that's interacting badly with Ren'py.
Try clearing up some space and then fully power down your device (NOT restart - a full power off). If it's a storage or driver issue then that will fix the problem.