I really appreciate that a lot. And no worries, man. Your career and schooling should always come first. I'm actually surprised at the rate you have been dolling out updates, honestly. Most devs it is once every one to six months.
If you want more meaning to the money, redesign the UI a bit. It will be a large effort, so something to think about for later, though. But, yeah, make a separate screen that is the Occult Club's meeting spot. Let players purchase decorations for it that show up in the clubhouse and give permanent buffs. I have seen a LOT of idle games do that. Granted, most use CG characters sitting at desks or whatnot, but a more cartoon-like one could work as well. You could make it so each furnishing has three tiers and each tier gives a larger buff, but once unlocked the look and style of the previous tier can be set without weakening that buff. For example, the sofa they sit on in the anime could be tier 3 and give a 15% speed boost to all meters. The first, tier 1, sofa could look like a used and beaten one with holes and fluff showing and give a 5% speed buff. Tier 2 could be the same sofa with patches and give a 10% buff. You could then also allow them to purchase completely different styles of each furnishing and room's wall and floor appearance, solely for aesthetic, to customize their club their own way once the tier is maxed out, allowing for club themes such as goth, kawaii, nature, or whatever. Maybe swap out the three tiers of sofa's style for a pink and white one, for example, if they want the kawaii vibe.
You've got the basics of the game, and have a lot of ways you can go with it. This is a hobby, not a career. Don't feel obligated to rush. That being said, if you ever want my long list of ideas, feel free to hit me up. Or I'll give you my discord and we can chat. Just remember, I don't think anyone is going to be angry if you focus on real life shit first before getting around to updates and bug fixes.