Oh, guys, there were not any posts in about 2-3 days and I thought there is no any interest in game.
Ok, answers are follows:
1. Yes, I consider to make portrait mode
2. Well, increased resolution may be interesting because my first thoughts were to implement vector graphics
3. I did include ALL packs from vexed.sf.net
4. Well, now I include all levels in regular vexed .INI format (and put them to binary) and loading is not optimized, so including 800 levels can take long time. I consider to move levels from binary to external dir
5. To remember last level -- yes, this is a feature I somehow miss. Think this is first I implement next version

Thank you for your interest in game. Stay tuned. Next version is coming!