I have a very similar situation: a cat with a severe kidney disability, meds 5 times a day with at least 2h between each. We’ve been using a whiteboard but I am currently setting a smarter solution. My WIP setup is a raspberry pi with a static IP on my local network and a FastAPI app. This way I can also do a household to-do lists (did anybody watered plants recently?) and add connection to local smart lights (effects if meds could not be given with 2h interval before our usual go-to-bed time), etc.
It would only work for us since it is a household only solution. Our cats do not travel anywhere and I do not currently need to check for these todos when not at home. It may be different for you. Good luck OP, hope you will find something that suits you.
Never played the first one but both of them look stupidly addictive. I feel like it is a chill version of Xonix-like games. Not quite the same but I can vaguely put them into the same genre basket.