Credits can be modified via CE, the current address (as of 3/1/2018) is 221D634B710. The value isn't updated in game until the credits are spent in the shop (but they are immediately available). Resources in inventory can also be modified via CE but I haven't bothered to dig into them just yet. Same with ammo/health. Cheat wise, the whole game's pretty simple to map out.
I'd love to see a trainer on it as well but I doubt MAF would be wanting to put the time in (at this point in development) given the frequency of the updates. That address above will change with the next patch, as it has already changed since the game entered the EA phase, and was more of a proof of concept find than a definitive cheat. It would be similar to the situation with Oxygen Not Included.