It's really good if you consider it like an idle game for most of the game. Just when it's about to get tedious, you get access to the autopilot, which is able to make your ship computer handled, as well as the rest of your fleet. From there, you only have to intervene between levels as the computers fight it off. Knowing that the grind is pleasantly handled by the computer, you can just come back to it for real from time to time to overhaul your ships and try the highest levels you have yet reached.

In that it is decent, but I feel the grind is a poor excuse of a game design. While the game is fun despite it, it is mostly just there because the enemies get unreasonably stronger than the upgrades they give.