Not sure if you wanted more feedback from me or not but you're getting it anyway haha.
Here is how I see it at the moment.
First off, you say play a game in 15-20 minutes, but is that it a casual level? I could play an outwitters match pass and play in 15 minutes if I didn't care if I won or not. As it is now, I could easily spend 15-20 hours thinking about my turns on an evenly matched outwitters match, I usually don't spend anywhere near that amount of time, but I bet each of my matches take roughly 3-4 hours of my thought on moves at a competitive level. Now all of this aside...
I have 2 options if I want to play hex gambit. I can buy a tablet with a data plan, or I can buy one with wifi. I can't really justify paying a monthly fee for data on a tablet at the moment since I have my phone.
That leaves me with the option for wifi. I'll mostly only ever have wifi at my house. When I am at my house and have spare time, I typically don't play on my phone. Not only would hexgambit be competing with games like breath of the wild, ffxv, and divinity, it is also competing for time with watching movies or tv shows, hobbies, sleeping, hanging out with friends...ect.
Would I pay 300$ for a tablet just to play hexgambit? I absolutely would if I thought I would get the value out of it that I got out of outwitters. The problem is I have such little free time, and so much stuff competing for my time when I'm at home.
That was part of the brilliance of outwitters, pick it up and think about a match for a little while no matter where you are.
I know I could use my phones hotspot to hook up a tablet, but I'm not going to be sitting at a doctors office and bust out my phone and tablet and hook up the wifi just to be able to think about moves for a while.
I'm not sure if my perspective is unique or not, but I thought it might help. I understand why you guys made the call you did. I'll still support the kickstarter and get a copy of the game even if I only play it for a few hours like I did with sft. I'm just super bummed.
Looking forward to the news on the other platform!