Can the Crypt of The Necrodancer have a bigger discount?

Since it's a daily deal and also the lowest price it's ever had, I don't think it'll go lower.

It's VERY unlikely. But it probably will end up in a daily deal later, again with -50% discount.

Boot up few games with cards, sell them, then buy the game. It's worth the effort.

Probably, if you're willing to wait until the winter sale

During this sale ? Nope. When game gets daily/flash deal then it's maximum discount. This probably also cover games discounted after community reach game milestones (but not sure).

If its on the daily sale i doubt it will get a bigger discount.

View attached image.