Oh, yeah, game mechanics or game physics engineering is amazing, but understand it's about 1% (if that) of what makes a successful game. I was watching my nephew play Fortnite over thanksgiving and thinking to myself "gee, the graphics are shit, essentially low-poly with some nice shaders!". And CoD Black Ops puts the physics to shame (and thinking that old timers used to tell me the physics of that were bad compared to e.g. PubG/Battlefield). But Fortnite is super colorful, and for a kid just coming off Roblox, it's accessible enough to play. So the HUDs and UIs and leveling and map dev and a million other admin tasks are where the majority of your game dev experience will be. Even doing some (gasp!) web dev, for things like in game stores and so forth. The gameplay mechanics and physics math of particle engines or calculating missile intercepts or inverse kinematics (jacobian matrices anyone?) for skeletal animations are mostly solved problems, but they can still be interesting to reimplement.