Space Pioneer

This is a good time-waster. Battle sessions are short and there's enough progression to keep you engaged. Voxel-based visuals look good on small screen; it may be better on tablet.

It comes in-app purchases. The items offered are almost pay-to-win. Ive seen +armor and +damage.. but (i think) you can grind your way to getting them.

Note: I'll continue to update this review as I play more of the game.