DEEEER Simulator is a physics sandbox game developed by Gibier Games and published by PLAYISM. You play as a person reborn as an odd deer. Said deer has a number of strange abilities, including being able to stretch their next absurdly far or wield guns on their head.
The main goal during your time as a "normal" deer is to cause as much destruction as possible. You can destroy large parts of the environment using weapons that are scattered throughout the area. There's also the threat of the animal police force trying to catch you — they can't exactly put up much of a fight against such a chaotic creature though.