How about just making us able to 'skip' levels we already beat? Ie, trade valor for points depending on the last level beaten.
That would remove the boring grinding part and still keep players busy for a few minutes for the 25 (+hard) levels.
I'm pretty sure most players on an idle game don't want an event as time consuming as this one (and if this repeats the last invasion event, we know it'll only get worse near the end).
Another option, probably easier to change, is to reduce the daily valor and increase the points obtained. Pretty much the same as what happened with mining/woodcutting NRG.
edit: after fixing the refresh bug, obviously
That would remove the boring grinding part and still keep players busy for a few minutes for the 25 (+hard) levels.
I'm pretty sure most players on an idle game don't want an event as time consuming as this one (and if this repeats the last invasion event, we know it'll only get worse near the end).
Another option, probably easier to change, is to reduce the daily valor and increase the points obtained. Pretty much the same as what happened with mining/woodcutting NRG.
edit: after fixing the refresh bug, obviously