As I've mentioned on Discord, my current thought is that I will release the first test version when the following features are supported (on top of what's already supported):
- Enforcing the skillset
- The Blocker and Turner skills
- No-effect objects (ie: OBJ.xxx and ANIMOBJ.xxx)
- Postview screen
This should allow the following levels to be solvable:
- Practice levels for Blocker, Turner, Climber, Floater, Virtual Lemming and Splitter
- Official Fun 11 "It's A Classic"
- Official Tricky 33 "Shadow Maze"
- Official Mayhem 66 "Family Tree"
- LP3D Fun 6 "Indoor Maze"
(There are a few additional levels that provide, but don't require, Bombers on top of the above. These should also be solvable provided you don't make mistakes.)
Not much of course, but it's a start.