Absolutely terrible game. It is extremely repetitive and the scaling is ridiculous.
* There are only 7 types of enemies in the game. The vast majority of them are just damage sponges with nothing particularly interesting about them.
* Upgrades cost easily 3 levels worth of cash to upgrade, yet have an extremely minimal payoff. Every few upgrade levels, there will be a massive spike in upgrade costs as well, but no noticeable payoff.
* There is no point upgrading the ship. If you can't kill the swarm on your own, you're dead anyway because the ship's weapons are even more useless than your weapons. That's saying a lot since your own weapons are pretty weak as well.
Most people die around wave 10 on average. Maybe that's a good thing, because I got to wave 23 (score 19336) using an autoclicker to try and see what's behind all the difficulty, and found nothing new or interesting.
Experience it once and then never play it again.