>>106496451
>The problem is I still need to implement game systems for stuff like entering vehicles, jumping, falling, running, climbing, dying, picking up objects, special abilities, etc, and upgrading weapons.
Unless that's 2D, you are aiming too high. FUck, I'd say even then, that's already too much. Make a "tower defense" where you are a single sniper who has to abandon his tower during the day, climb another while removing small annoying enemies, and then getting ready to fight during the night by sniping packages coming from the sky. Very little movement, you'll have jumping, running and falling. Also dying. Forget picking objects, but you can include special abilities and upgrading them. Don't over do it. Fuck, again, I think this is a lot already.
