It looks decent, but there are some issues:
1 they should be totally random, not just spawning for the top players
2 there should be a limit to what u can do, like u can't do below 5% of your power similar to the encrypts, plus high warp evasion for smaller commanders in the area
3 fastest clicker wins? not sure how this will go, since allies and truced people won't attack each-other
4 waiting for hours on end every 4 minutes for wave after wave? that's definitely messed up, and the frequency of incursions should not favor anyone, everyone has different time zones
5 don't give too powerful rewards to keep it balanced
and that's about it for now