You need to grab the .APK file from an online mirror. If the apps are free, there are quite a few good trusted mirrors. If they're paid... you'll be looking at piracy websites, even if you own the games.
Then you need an Android emulator or translation layer. For Windows, this is Windows Subsystem for Android. You can follow a guide to install it, and then there are tools on GitHub that make opening .APK files easier on it.
On Linux there's a similar project, but I honestly can't say much about it.
That being said, you want Stardew Valley and Castlevania SOTN? Why not simply use the native PC versions or an actual console emulator?