Nice idea. I think currently, there is no reason to buy the low value pieces at all. A way to encourage buying low-cost units is to limit vigor generation, but have pawns give a minimal vigor generation buff when spawned; knights give more; bishops give even more. Another way is to give units different abilities such as movement-slowing or projectiles.
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Duddee those are some cool ideas. I'd definitely consider adding them in if the game goes beyond prototyping stage. Having unique abilities for each unit was a part of our early development plan but we couldn't get to it in time. Do you have other ideas or stuff you wanna see implemented in the game if it were to go beyond the prototyping stage?
Thanks for the feedback btw :)