I just got GHPC on steam - it's nice, but like @Thorn just made me come back to SB even though havent played for a few years
It's fun, quick action. Graphics are nice (not that it matters much).
But it's missing so much compared to SB..
I fell $25 might be a bit much at this stage of development.
Maybe if they had multiplayer.. but I'll chuck my spend as "supporting devs".