It's kinda impressive that Bloodstained sold better on Switch in its first week than the PS4/Xbone versions, despite the two big factors against the Switch version:
1) A notably downgraded version that needs more polishing from the dev team
2) The Switch having a smaller userbase/percentage of the UK market compared to its contemporaries
Do you think it might have been helped by release of Super Mario Maker 2, which likely moved some units? Then again, SMM2 could have also affected Bloodstained as they are both platformers (albeit, completely different in concepts)...