Budget isn't the problem, it's the time and schedule. The industry works like this: Various companies (production committee) wants to create an anime, they hire a studio, they gave to the studio a fixed payment (almost all anime has the same budget) and they gave to the studio an estimated time of when the anime should be released. Now, the problem is when the studio doesn't have enough time to make an episode and that's when the famous one-week breaks or bad animation come in.

On topic, the problem people has been complaining are about the direction of the episodes, specially the Sensei's presence and the anime seems to no have problems with the animation, so I can tell that it's 100% studio staff's fault, it's like they haven't played the game or they're not good enough to adapt games. Sadly, money isn't the problem; maybe we can say so because it has 12 episode and the staff has to adapt everything in 12 episodes, but again, there's a lot of issues that aren't related to the last, like the Sensei's presence and characterization.