Its an interesting choice, the original show made a deal out of "four adventure time zones" (until Ocean came along) but the choice of games for it may make it look like a mismash of styles. Time will tell.
Re: Budget, well Crystal has never been cheap. The original show was apparently £125k an episode.
I recall reading the original plan was for the 4 zones to change every series, but the sheer expense of filming a single episode meant only the Industrial Zone was changed, a few series in.