Hm.. I installed it from itch.io client on Linux. This what I was able to research for the version:
$ ./diver_down-linux64.x86_64 --version
3.0.2.stable.official
$ md5sum diver_down-linux64.x86_64
a983f185cddde39880d9acc37174265a diver_down-linux64.x86_64
On itch.io it is reported as : game 318624, version #1105963