Another viable option would be creating a key configuration menu in the options. I don't know enough about unreal yet to tell you how, but I assume it would be in changing the action bindings. Again, it's been a while since I did anything in UE4, so I may be talking or my a$$.
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You can't climb ladders because when I tried you ended up behind the ladder. You could still climb up, but you'd end up falling once you reach the top. That's something I'm working on. Right now, money is essentially a score, later I will incorporate a shop function where you can buy weapons, armor, and possibly upgrades. Thanks for your feedback. I'm still working on it and I plan to update once I have a stable release.