First of all, a new public alpha release will be coming soon. Most notable changes in it will be the addition of new flying enemy called "dragon" and a long list of enemy AI improvements. There will be a couple of new levels and many smaller improvements and bug fixes as well.
This next alpha release will likely be the last completely free fully featured release as I'm planning to enter Desura alpha funding program. There will be a free limited trial version too and I am going to have both versions also available as direct downloads for those who don't want to install Desura. Details on trial version limitations and pricing of the full version are not yet decided. I will let you know when I know more.
I have been refining my plans for the future of this project and re-prioritized stuff on my to do -list. I didn't completely drop anything from my list, but there's a lot of stuff at the end of the list that will probably never see daylight. One thing that got moved up on the list is some sort of mechanism for easy sharing of user created levels.