Let me start this by saying that I've only played 3 times, and whether you implant this idea or not I still like the game. This was my original preconception of how the skill tree would look.
I envisioned something like: (0-9 ability, | \ / or _ connection, - white space.)
--0----1-----2-- +
-/-\---/\-----|-- +
3---4---5---6-- +
-\-/-----/---/--- +
--7---8----9---- +
ect
lets say for regulus: (When I say levels I mean like SoaSE where one tech item can have 1-3 levels)
0 - AoE, mines (damaging kind) damage + with level (2 levels)
1 - Range increase (3 lAoels)
2 - Aoe angel ability, increased ground damage + w/ level (2 levels)
3 - Better tinkering, Reduced cool down & +damage / stun for all mines (2 levels)
4 - Harpoon gun upgrade, + RoF or something (2 levels)
5 - Snipe (2 levels)
6 - Allows the jumping (and dodging damage? if not just increased AoE) (1 level)
7 - Stun Mine (1 level)
8 - Crippling attacks (2 levels)
9 - Angelic Aura (speed+ and perhaps more damage for the AoE angel spell) (2 levels)
AoE then you can have little 'aside' abilities like just coming off of 4 you could have a 5% better chance to critical ability (1 level)
Then the + represent the attribute bonuses (10 total)
Other Ideas to add:
- You could make it so people have to spend up on the attribute abilities to reach higher in the skill tree, there fore meaning you could go a jack of all trades missing the high end stuff but being more versatile or you could specialize in an area or 2 and completely forget about the third. (i.e. ignore angelic and take the others, or ignore mines and take the others)
- The connectors could be OR or AND connectors, or you could even incorporate both. (You need both mines and range increase to get the better harpoon gun, but you can have either the improved thinker or the harpoon gun to get the stun mine.)
Reasons:
-It would make the demigods more versatile
-It would make the demigods feel more complecated and unique.
-It would make skill choices more important. (As you have to think about what you want later on)
The system you have now is fine, but just saying what I originally thought it was going to be like.