Thanks for playing and for the kind words!
Funny story about the infinite mode. That was how the game worked until like, a week ago! The problem with it, as you anticipated, is that if the game goes on forever the only good strategies become the "exponential" ones. We like having the balance of more "linear" strategies being viable as well. Maybe we'll add it as an option at the end later!
Larger boards and boards with obstacles are definitely something we've considered, as either "characters" or "ascensions" - we're trying to get in the core tiles first though.