The introduction of seasonal achievements along with the Season of Joy has been a resounding success for this community. Personally, i don't remember ever feeling so joyous in my whole life. Actually, i'm feeling so joyous that the people around me are wondering if perhaps i need a psychiatric evaluation, and i might have to slap myself really hard in the face a few times in order to feel a little less joyous, but i'm digressing here.
My suggestion would be that the next season be named "Season of Bugs".
This season should entirely revolve around fixing the bugs that still affect the game, like the IPM report showing the defenses BEFORE the impact instead of after. This bug render the report itself completely useless, because you damn well know what defenses are there (unless you need to be taught how to probe). But it's months and nobody bothered to fix it.
The seasonal exclusive content should consist of an avatar of an animated cockroach at the cost of -50 DM (yes, minus fifty, you get a refund of 50 dark matter if you take it), plus the title of "Plagued by Bugs" which will become available after the 3rd time you see one of your attacks failing because of a bug.