Low-budget fare can always be tough to score since there’s always a question of where to put the bar. In the case of Castle you could argue it’s just meant to be a retro platforming romp, keeping things simple for a reasonable price. The issue may just be how simple and how it stacks up with its peers on the system. One note I would make is that the timing intervals of platforms and moving (or disappearing) elements don’t appear to be synched, so I’d imagine it would be speed runner kryptonite to some degree as well, and can result in some long pauses as you wait for things to line up a bit more in your favor. This has actually become a pretty crowded space and unfortunately I’d say on roughly all sides it gets trumped in quality. It isn’t the toughest, the prettiest, the most creative, the most fun… it’s just decent but entirely forgettable.