MINEKILL
Runs Minecraft's player, physics, mining and mobs inside ULTRAKILL's levels.
Releasedby niliota

Requirements and setup
ULTRAKILL (Steam, Unity 2022.3 Mono x64) with BepInEx 5.4.23.2 win_x64, Minecraft 26.3 with Fabric Loader 0.19.5+ and Java 25, your own copies of both games; install Minekill.ULTRAKILL.dll and minekill-minecraft-0.1.0.jar from the same release (or build from source). The README says the author develops on Linux with ULTRAKILL under Wine and Windows is untested.
More Minecraft in ULTRAKILL
Released