Describe the bug
You change the soname of libbge with each version, but this should happen when the ABI has a change that conflicts with the previous ABI, not with every change.
Every time the shared library ABI changes in a way that could break binaries linked against older versions of the shared library, the SONAME of the library and the corresponding name for the binary package containing the runtime shared library should change. Normally, this means the SONAME should change any time an interface is removed from the shared library or the signature of an interface (the number of parameters or the types of parameters that it takes, for example) is changed. This practice is vital to allowing clean upgrades from older versions of the package and clean transitions between the old ABI and new ABI without having to upgrade every affected package simultaneously.
READ: https://www.debian.org/doc/debian-policy/ch-sharedlibs.html
Describe the bug
You change the soname of libbge with each version, but this should happen when the ABI has a change that conflicts with the previous ABI, not with every change.
READ: https://www.debian.org/doc/debian-policy/ch-sharedlibs.html