These are three genuinely good catches, and all three are real.
1. You're not imagining it, but it's the isometric projection rather than the controls. Ground speed is identical in all eight directions; an iso tile is twice as wide as it is tall, so the same world speed covers ~22.6 px/s horizontally and ~11.3 px/s vertically on screen. I'm keeping world speed uniform on purpose, if I compensated per direction, an enemy chasing you would gain or lose ground depending on which way you happened to be facing, which is a worse problem. But the feeling is legitimate.
2. Correct, and it's deliberate as in co-op the module choice is per-player, so pausing would freeze your partner. What the game fails to tell you id that the offer never expires. You can walk away, deal with whatever is chasing you, and pick when you're safe. That it reads as "the game ignored me" means I haven't communicated it, which is on me.
3. That one is a plain gap. There is a pause long-press the top strip of the screen for about half a second, and on Android the system back button also works but nothing on a tablet tells you either exists. Ill be fixing the discoverability.
Really appreciate you writing these up.