I was going to ask the same question about lottery tickets. Also, unless I’m missing something, I really wish there’s was an on screen warning for when the reaper is about. I’ve lost count of the times I’ve gone back to avoid the joker or check something having forgotten it was active.
It’s subtle, but there is an on-screen indicator. A skull appears in the bubble between your health and food bars.
More lottery tickets could suddenly be used later, presumably when my level was higher. Also found fish exchange place
Was just flying through the arena until I hit fight 34. Lol. Gonna have to actually think for the first time in a dozen levels or so.