Wow. After the Switch Presentation I looked at the launch day games and went from "Ready to fight tooth and nail for preorder" to "Wow, there aren't enough games at launch to justify a day one purchase for me".
But this game has been on my Steam wishlist for a while, so I was tempted. I like twin stick shooters, and I really like roguelikes (I play nethack irregularly but often, and FTL was probably my GOTY in terms of titles I discovered in 2016). What put me over the edge was the trifecta of (A) being able to play it on the go, (B) the vague promise of something special for preorderers from the developer, and (C) Amazon Prime Savings, which took eight bucks off the purchase price, making it just under the regular Steam price even after taxes.
So I think this is the first time I'm getting a game at launch for a system that I'm not getting at launch. I'll have to try rectify that somehow, but I'll be content with staring at the box art for a few days or weeks.