These events really need their own independent mini-game system to be fair to all types of players. I know people have said Spire was basically copy/pasted from one of Inno's other games; is there any other content from those games they could adapt for this?
Honestly, I'm really surprised at how many obvious opportunities Inno just doesn't take. I've play f2p games a while, one of which is a company that runs several games like Inno does, and it's like every 3rd event they do crossovers: do things in one game to get prizes in the 2nd, and do things in the 2nd game to get prizes in the first. Easy quest content that actually has variety from what most players are used to, with the added bonus of getting people interested in their other games.
I haven't spent a lot of money on this game, but that other company I used to play 2 of their games, and only got into the 2nd because of one of those crossovers, and ended up supporting it quite a bit. I've even previously been a "whale", just got burned after spending $500 ish in my first month of playing a game only to have it shut down a month later. But for me that potential is there, as long as I enjoy the game (big checkmark here) and see that it's being managed well (big checkmark here later scribbled out hard).