Found on a post here and on a Russian romhacking forum, this is DuckTales 2 Extended, This hack has the following differences from the original game: graphic improvements, new secrets, and also supports English and Russian languages to choose from.
Included is a patch for the original GB release, a patch for the unfinished GBC release and source code for an unfinished GBC release for anyone who wants to finish it. The author released the source for the original Gameboy release, but at the moment it appears to be lost, if it is found, this will be updated, as the Gameboy version has a Russian translation as the GBC version does not.
This hasn't been updated since 2017, and the author hasn't been active since 2020, so it's safe to say this is abandoned, though the original Gameboy version is complete.
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