The game is being developed on Unity.
And why did you choose this environment and not unreal?
It is the decision of the team to use that engine. It would probably due to the flexibility and the devs more experienced using that engine.
Was the main reason for choosing the engine was the size and capabilities, putting aside the graphics you can do 30000 units on it, unreal has 10000
I can't say for sure but I can try asking the team.
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