What is the thinking behind marking ES2 at 25% off on the Humble store at the exact same time that it is 50% off on the Steam store?

Thanks for reporting this!

The promotion on Humble should match Steam (-50%). Hopefully this will be fixed ASAP...

The discount has just been updated to -50% on Humble ;)

Cheers!

I asked in Discord too, but is there any chance you can amend the -50% discount to apply to the Digital Deluxe upgrade too, please?

Hey Aitarus, sorry for the delay to reply.

The discount should be applied to the upgrade (on steam) as well! Should be updated later today ;)

Thank you so much. :)