They did get quite a lot, but you need majority vote in the senate to shoot down new laws. In practical terms they can delay laws but probably can’t shoot down anything. Netherlands is a country of polderen (1).
I think some of their opponents will argue “they did well but not well enough, so it’s fine to keep ignoring them” but I don’t think that’s a wise move.
Only in the senate and some provinces, which aren't that influential; I'm willing to bet that they'll do a lot less well in the parliamentary elections: people who feel strongly have more incentive to vote.
They were never "ignored"; this entire issue has been playing since the 80s. Every time any measures are announced there are protests and measures get watered down or delayed.
The largest party in this case is only around 20% of the votes. There are several other political directions that have more votes just split in more than one party. For example the green/left combination also has 20% of the votes and the government combination has 31%.