Alpha 20 sounds like it will be interesting. Challenges 🙂
The existing technology tree is a fantastic idea, but with respect, it is very poorly implemented. There is no challenge. All you have to do is build a library and speed up the game until you can research everything. This is a huge missed opportunity for visible and well defined challenges and it sounds like a brilliant candidate for improvement in Alpha 20.
Fortunately it is easily fixed. For example, stop the library from generating more than twice the mana you have gained from killing things.
Another one is training. Stop the training room giving more than two levels since the unit has last killed something?
If this makes it too hard, then play father Christmas and give out some buffs that balance the game again. There are a long list of things that players have suggested that would help out there.
Whatever you decide, looking forward to it 🙂