@Castle: Hey, to answer your question that sort of game is possible to make with the toolkit, though how difficult it is to implement will depend on how you want the end result to be. A couple of updates ago I added the option of turning off turn based mode, which basically means that the current unit gets an infinite move score that can be split up freely. At the same time I do not show the blue markers for tiles in move range. The effect is that the player can move around freely until you disable free roam mode and turn based combat resumes. This is more or less a fully realized feature and easy to implement. If this sounds like what you want to achieve it should not be too difficult.
Too bad about your problem with payment, though. You should e-mail marketplace support and see if someone from Epic can help you.
@Bantichai: Good luck! Let me know if you get stuck.