would it be alright if I had someone modify the engine for me, aswell as put any assets in it I would need for a fangame and/ or indie game (or just straight up turning it into the game/ game engine I want made)
It's totally OK making a game with my engines / asset packs, and you're allowed to sell those (no questions asked, no credit necessary, no licensing fees / royalties necessary) - just don't distribute the source code files.
