Thanks for the feedback! As for the issues you mentioned:
1. That is kinda how the system is meant to work, but it can be a bit awkward if there is an enemy over the capital. Technically I think you can nudge them out of the way but yeah it is a tad strange.
2. Yeah I noticed that issue. The AI was honestly a bit rushed so I didn't iron all of those bugs out.
3. They actually can capture your troops, but I haven't actually coded them to intentionally do so yet so its just really unlucky if they do right now.