Should I do a post mortem verison?

The game has been doing very well i think and I have some ideas on how to improve it after all the wonderful feedback! Do I wonder if it is necessary to spend time on a more then playable product? Thats why I ask you:
Would you play a better version with less bugs and more features?
Should i spend time on this instead of otter projects?
Some of the features would be:
More options in the menu
Power ups
Bug fixes
Level balancing
More awesome sound effects
Tutorial
and more