If you are looking to release this game internationally, I might offer you some advice to keep away from the lootbox thingy.
During various international internet laws going on at the moment, Spain seems to be taking an issue with any game with any hint of a gambling mechanic. (Even if it's just a non-functional skin or cosmetic.) And I think even if it doesn't cost any real money... I'm not a lawyer, but I'd still advise caution.
I believe that by making a game that's fun to play and has the hard work applied to really polish it up; you're going to have players willing to pay. Especially if there's a way to keep it competitive with speedrun/time-trial challenge, or skill-based tournament play.
NGL, it's nowhere ready yet. But as I mentioned earlier. This has SO MUCH potential.